I would put the 1150 at 8mph minimum and the 1050 around 12mph.
The PNG is such a different beast compared to the HPS. 1150 is my favorite pumping and light wind wing. The 1050 carves much better, is way faster but has a faster stall speed.

r0d said..
Thanks broVan, super useful info. Doesn't sound like there is an HPS wing to replace the super low end of the 1150 or BSC 1120 (which I have).

Yep I agree completely with brovan. I have 1150 and 1050. Both great wings but very different, for low wind around 8-12 knots the decision is simple 1150 is king.
The 1050 can go fairly low still, once it's up, but much harder work getting it there.
As soon as I can comfortably switch to the 1050 (or 980) I do though, they are so much faster and more fun.
So as you said there is nothing in the HPS range to match what you have.