I am going to give wing foiling another shot. Last fall I bought a Naish Hover DW board (7'2"x24" and 125L), a Code 1540S with the 188AR tail and the long fuse. My plan was to buy a smaller stab as I hopefully get better, and then the 1130S as my "small" front foil.
I have friends who are smaller in size and weight than me, who wing on F-One foils, mainly the Sk8 and Eagle lines. They have been asking why I don't give the F-One Seven Seas 1500 a shot and then add the 1100. I have hesitated on F-One somewhat because I was considering buying the Code 1725S for really light days. If I take the 1725S out of the equation, how do the Seven Seas in 1100 and 1500 compare to the Code 1130S and 1540S? Lift, glide, speed and so on.
My main objective for winging is to get jibes down, learn to ride some waves/swells, and eventually upwind/downwind winging

Me: 6'4" 230lbs 57 years

Wings I use currently are a 7.7 Ozone Lite Force. A Duotone 6.5 Slick and Duotone Units in 5.5 and 4.5.

F-One have just changed their mast to wing attachment and upgraded the SK8's from V2 to V3 so expect to see some bargains floating around on the older system and wings. re the Codes the 1130's is the biggest I've ridden and for my 86kg (190lb) that was heaps of foil even on super light days 6m DT is my biggest wing . I've only ridden the smaller V2 SK8's on the F-0ne and they have a pretty weak bottom end, especially compared to the Code Series, which supposedly is now fixed on V3's . Their old mast still had some flex but haven't tried the new ones but the new Code "PLUS" Mast is the bomb and definitely get that if you intend to use the 1130s , 1300s , 1540s or 1725s you'll need it. Nothing worse than mast flex, especially whilst learning.

That's already one hell of a foil setup (modern design and easy) let alone for learning on.

Ignore the mate's for now and just put the time in on your existing gear which is more than good enough to achieve the goals and then some that you have set out.

Put the time in whenever it is 15-20knots for now working on technique and you'll soon be amazed just how small a foil you can get going while pumping the wing/board which then makes the rest of the time on foil more fun.

It's always tempting to buy more and more gear but I believe it's really only with substantial time on existing gear that the need (or in some cases not needing) a different size/model becomes a more obvious decision.

TL;DR - drc13 nailed it.

In more detail: it is not just about the foil, it is about the whole system. You are on one of the best systems (Code) for big guys because it is very stiff. At 210lb geared up, I can't recommend the previous gen Fone gear due to the lack of stiffness. Not an issue for lighter riders, so ignore the mates. Can't comment on the new gen Fone stuff.

With respect to the foils you asked about, the 7seas is an older gen foil with a lower aspect ratio and thicker foil sections than the Code S. In my experience, if you are starting from complete never-foiled-before scratch, these older, thicker and lower aspect foils like the 7seas are more forgiving. This benefit lasts maybe about 10 sessions max, and then all the advantages of the Code S foil take over and it will almost certainly be the better foil to progress on. Considering the system stiffness differences, the crossover is probably at more like 7 or 8 sessions tops. So, like drc13 said, you have great gear so just stick with it.

If you cannot foil at all at present, try to split the learning task. Handle the wing on land. If you can, borrow or buy a cheap used offroad skateboard. For foiling, spend a few hours towing behind a boat. It may seem expensive if you have to rent, but learning to fly the foil without having to deal with the wing shortens the learning curve tremendously and helps you dial in your mast placement.

Don't worry about a bigger foil than the 1540 right now. Skill will bring your low end down from where it is now more than any gear. For gear,a narrower board will likely make a bigger difference to your low end than any foil or wing. You board dims sound great for a 1st board, but a more advanced board will unlock a a bigger performance envelope once you are ready to deal with the drawbacks.

I've tried the Seven seas 1100 & own the Code 1130s. I think they are very similar & both very forgiving, great glide, maneuverability & excellent for learning gybes etc. They tend to keep you up out of the water when gybing which helps. The seven seas 1100 is a newer generation 8 aspect & a beautiful foil to ride. The skates & eagles are a different breed & you'll struggle at this stage. I'm 86kgs & can't stop riding my 1130 because it's so easy & fun even though I should go back to my 980 . I wouldn't change systems if you're already on code especially for a big guy.
I'd actually give the new F one system a year to see if there are any faults with the new system before buying.

When you say you want to give foiling another shot, it doesn't sound like it is a problem with the foil. Foiling is incredibly frustrating to learn epecially if older so you do have to stick with it. Some learn fast (bastards) & others, like myself, take a little longer to get it dialed. Whatever foil you get, keep on with it.