Yes, the TKR1333 can strip easily. I bought a bag to keep some on hand. For Christmas I got a Makita power screwdriver and some nice hex tip bits. That really helps keeping them from stripping. The hex recess in the screw is not very deep so if the hex tip of the tool wobbles at all (like when doing it by hand) the hex recess strips easily. Plus the screw is so long that the power tool makes life so much easier.
You may or may not need two diff shims. Only use as many as you need to get proper gear backlash
I haven't had a problem with TKR1346.
I agree on TKR1333
If you can do it, I would replace with a cap head screw if it is possible. i did that in a pinch as that is what I had and it worked fine however long term don't know.