I've made my point and the image was amongst those posted here.. I wouldn't even "up" the starter torque. The mechanism isn't without it's problems, already.. You'd have to be voiding the engines certification. Nev
It has to exactly right OR it's not worth mucking around and risking it IF something fails it's in amongst the cogs.. One of those drive ends has a pin in a hole in the end for extra strength. The teeth have to have the right dia an tooth pressure angle also. Nev
In turbulence you will more than likely need to hand fly the plane. Fitment of an autopilot is not without risks.. If you are not alone someone can take over at times