I'd suggest a senior or ladies flex in the Tee would help promote more of a trampoline effect and minimising breakage. Does the wheat not bend with the wind or it would break 
As a 13 h/cap, I would suggest a zero friction tee with a firm shaft and a high kick point. That will maximise your swing speed, increasing your ball speed, producing a better trajectory and eliminate your slice.
Only £130 for 3![]()
Don't let he's handicap guide you bob, he swings like he's chopping logs, I reckon he needs an x flex tee