Been a while since I posted to this thread but wanted to post some impressions of the SF wings.
I've been using this combo loads since early summer/ sf830, s192, af72, c650 and I weigh around 75kg. I managed to sell my af85,c700 plus some HA wings as a complete package and now I am waiting for my UHM 80 mast.
Honestly the sf830 is an amazing wing, I have been doing some light wind winging sessions here in Spain and I can get it up in about 10-12 knots with a 4.5 wing and my DW 7'2 board. Once up it maintains speed and has loads of pump to get through lulls.
I've also been parawinging with it recently and got it up quite easily, again with the 7'2 DW board. The sf 830 is my daily driver. I also own a sf1080 which gets going early and has an even lower stall speed but is noticeably slower and it definitely needs more active control in small swell to not breach on the way out.
having said that, when freeflying or with parawing stowed the sf830 setup sometimes feels a bit wobbly. Not sure if this is some swell or current at play or the fact I am running a af72 mast with the downwind board. I'm looking forward to testing everything out with the UHM 80cm mast to see if it makes a difference - I certainly guess it will and happy to report back.
my third wing is a dw1400 and this has been a bit of a love/hate affair. Originally purchased with DW sup foiling in mind, I've been using it parawinging and it got me my first flights. But, It's a beast to manage and turn compared to the sf1080 so it will be staying mostly at home I think (until I can sell it).
Right now I am getting some small distances (200m) with the parawing stowed, with winging it is more like 500-600m. I think for my conditions at home (short period windswell) the sf wings will be totally sufficient to train on and master the downwinding properly .
If I got my hands on a DW 830 or 900 to test I would jump on the opportunity however I doubt at the moment I would buy one without testing.. I need some convincing