Jeroensurf said..
You friend got an extremely good low end set up. :)
I owned the V1 Super-k 92l so know that board quite well and demoed the Atlas 1130.
That combo almost takes of by itself and turn reasonably well but I found it also very slow.
The Enduro1300 has a similar take off speed, turns imo better and is faster.
When I put it in numbers I would say I can use KT 100-150cm2 smaller as some other brands while I need to pick AFS an 100-150 bigger for low end.
The top end is whole other game. I have ridden waves with the E1300 (wingfoil and Supfoil) over 37km p/h with full control and If you let go the numbers and just look at feel the 1300 is what you need: significant more low end and lower stall speed compared to your E1000.
Why not the 1100? I have the E900+1100+1300+1600 and think the 1300 covers 90% of the same range as the 1100 but with lower stall and take off speed. The 1100 work better when its more windy and the 1300 become a handfull, but ..you have already your 1000. If I would buy it again it would probably 1300-1000 instead of 1100.

UG stab:
I really like it for its glide and dragless feel once on foil, but if i get you right your issue is not with gliding but to get on foil, and in that regard that stab has no benefits imo.
Once on a foil its great. I just had an DW run with the wingfoil today (not yet into parawing) with my Pure HA1100 and replaced the HA stab for the UG41...whole different foil! The low end hasnt changed, but a lot better glide and pretty good turning and riding in the given conditions.
it also proves to me to not write off older foils.
I bought the E1100 last year and have the pure1100 now 3years and altough i really wanted to like the newer enduro, the older pure HA simply suits me better.
similar low end but more slippry through the water and better acceleration+speed+glide.
The E1100 turns better and has a slightly lower stall but with the pure its really easy to stay at speed that that isnt an issue. I guess the Ultra,s are more similar to it.

HA stab,s:
First get the 1300 and see how you like it with the HA40. For me that set up works as well altough I mostly use it with an HA43 to have just that extra bit to push against..but the differences are small between the 40 and 43.
This also a situation where I already have it, but If I would do it over again I would probably go for the biggest carve as i,m quite impressed by the U-carve140 with my Enduro900.

BWalnut said..
Congrats on the progress! Soon you'll be measuring progression by 10 minute marks.

ug41 is an awesome glider that will outsurf your HA and the skinny 80 is a super fun and slippery mast. Both great upgrades for your kit.

The new ultra 600 is insane but I haven't tried the 750 or 900. I'd expect ridiculous glide out of that 900.