C4
I disagree with you. I am sorry to hear about the three crashes, but I would put that down to poor piloting, and losing too much airspeed, than doing a wingover that terminates downwind.
If you don't fall below 20-30 knots of AIRSPEED, you should still have plenty of performance out of the aircraft regardless of which way the wind is coming from.
By your logic, what is an Ag pilot supposed to do at the end of a run into wind? Maintain his current airspeed throughout the entire turn?
I have tought wingovers to many students in low level training, and still advocate that if you will terminate downwind or you don't know where the wind is from, do a wingover not a torque turn.