I have a dead motor (E10). I split it and cleaned it up but then the E10 ... All internals looked good and I have a new set of bearings for it. Make me an offer. It is in Scotland. I think I paid £50 for the bearings alone.
I would say if you are having flex issues with a 36 then a 38 will give a Levo chassis a real hard time. Are you sure it is the fork not the frame or wheels?
I was thinking of moving from Shimano to Bosch on my next bike, If I can get one of these along with the new minimal displays then it is a done deal. That Whyte looks good.
A bike with another brand of motor would be a good start. I am now on my 4th motor in 3 years (approx. 11000km). They are not serviceable and even though I like the way they ride my next bike will NOT have Shimano motor.