Dg - do you fly aeros? IAS is relatively unimportant when the 'G' loads are changing rapidly. AoA rules, you fly angle of attack, and as I've said before I'd gladly throw out a handful of the (not many) instruments in the Chippy for an AoA indicator!
Spiraling in tight thermals might qualify as aeros to some pilots (definitely to those I have taken along for a ride and who ended up barfing their lunch
), and I do that a lot as you can surmise from my forum handle.
I usually don't turn with 2Gs but still I have experienced incipient stall at a significantly higher speed than that for level flight, exactly because of the higher apparent wing loading, while trying to maintain a low speed (< 100 kmh) at too high an angle of bank.
As I have no AoA indicator I still have to estimate stall speed for a given bank angle if I want to keep on
not crashing into the mountainside every time.
Ciao,
Dg800