I've also added stall strips further outboard from the root to eliminate wing drop at the stall. It was enough to induce earlier separation at mid-semispan - less effect on stall speed.
djpil - could you please go into a little more detail? I have observed the mid-span stall strips on PA28-161's, and have wondered about the various reasons that they might have been put in that position. For example, to provide separation over ailerons to demonstrate buffet, to provoke separation outboard of the stabilator to minimise fatigue, to use a channel of turbulence at the mid-span position to reduce spanwise flow at the stall... But I'd like something that is less speculation, more wisdom!
If you prefer, PM me.
thanks in advance,
O8