Hi Richw,
I started on the BSC 1060 and it was a great foil for learning. Still use it in ultra light conditions (9-12 knots). I'm 70 kg.
Have the 900 and that had a better top end than the 1060 but missed the low down performance of the 1060. Have used the HPS 1050 and 930 and found them to be fast, but difficult to get running in marginal conditions. Pumping requires a careful technique. Tried the BSC 890 and PnG 910 back to back and found little difference between them. The 910 felt a little faster and more glide but I'm splitting hairs. But the 910 compared to the 900 is a definite step up in performance. I can get the 910 running in 11ish knots and have been out in 35+ knots in waves and mush and haven't found it to max out for me yet. It's just a sensational foil. Really user friendly with great performance. A great foil to progress on. I have an ART 999 which is a step up in speed on the 910 but it's 2 steps up in difficulty for me

. Unless it's perfect conditions, the ART will stay in it's bag and the 910 will be the go-to. If it's really marginal, then the 1060, but everything else is 910 material for me.
I use the 910 with a short red fuse and either a 420 speed or 325 progressive.
Compared to the HPS, the PnG feels similar in terms of getting it to fly. With many of the red series fuses (having the bigger leading edge) you can get away with stomping on the foil with your back foot to pump them up. The black series foils tend to stall when you do this. I've found the 910 is OK with pumping, but you have to be far more gentle with it or it will also stall like the black series foils.
Haven't proned with it yet.