True, me tackle is a bit bigger ("Wellington" keel) and the boat is heavy (Volvo 9hp ballast), but I don't have any issues with the ST compared to the pin head that was on there when I bought her.
Upwind, in moderate conditions I don't have any greater heel - so long as the leech is left open to get the twist required in the upper 1/3. Just need more outhaul and a bit less vang, and the sail really looks after itself. I would still reef at the same times once winds are over moderate.
What I do have is a small 'flattening reef' at 150mm (or 200?), that I use solo over about 15knts, that is well worth getting in any new main (IMHO).
Downwind is where you notice the extra sail area of the ST, great for those pesky no extras races! It is rare to have up too much sail going downwind in a R930!
Reaching is the area I am still working on, in the CC this year I couldn't keep the boat balanced from Hen & Chicks with the wind on the beam. Coming home I experimented with using a (bigger) A3 instead of the A5 and a reef in the main. That did seem to help.
So, I think a std keel and ST are a good option.... esp if the rig is designed for no strings at the back of the boat.