Might be better to post different problems separatly.
Yes you can use the lifter shims over.
If the idle speed is adjusted too hign then the trans can engage too quickly. Also there is a plactic check ball in the front pump that can allow(if broken) reverse to engage too fast even if the idle speed is correct.
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)