I finally bit the bullet and laid down some coin on a new board from Ocean Addicts. I was very happy with the Ace in flat water, but my lack of skill made it unpleasant in the ocean. Without testing I bought a 14 x 27.5 Carbon Falcon.
So far I have only had the Falcon in flat water. I'm 6'3 100kg and have ok balance, but not great.
I do a regular 9.2km river loop, so have a few times to compare.
First up the Falcon felt a little rolly when I first jumped on. I had been on a 12'6 x 25 falcon for the last few days and the initial roll, whilst not as severe as the 25 was still similar. It was fine through a wakeboard boats wash, so it appears to be just a primary stability roll.
The Falcon seems to glide between strokes better.... I am still not sure exactly where to have my feet to get the most efficient glide (first paddle and all) but it felt very nice and tracked nicely.
I rounded the halfway mark (4.6km) having gone into a current in 36 minute... very similar to the ACE... but I ran out of steam...or so I thought.
went a little into cruise mode and then found i was actually running a quick pace so stepped it up again. short of the long...new pb of 1:05.15, best on the ACE was 1:06.57.
Now to me that's not far off a tie, as there may have been a little more headwind, or different current or something, but my goal when going to the Falcon was to get a flat deck for ocean work and waves (as I did SOOOO much swimming on the ACE due to my poor balance

) without sacrificing flat water speed. TICK.
I'm looking forward to testing it in the ocean and waves, and sprint training..... So far so good.