Indeed
I'll have to agree with Stoney on this.
Positive Wshear is a Headwind because you will now get a LOT more lift and it will also increase the IAS.
Negative Wshear is basically a tailwind, you lose a lot of lift and IAS decreases.
If you start losing lift, raise nose, increase power.
If you start to gain lift, decrease power, pitch down.
I'm not going to say that I'm 100% on this, been a while since I did pof/perf.
Things I am certain of: Negative Wshear= Tailwind
Positive= Headwind.