I just went 3.6... I do that on most skis unless there is metal. It might be a hair tougher to screw it in, but it's not going to hurt them. at all. in fact I always use a 3.6 on armadas with thin cores to prevent stripping the screws out.
Haha when I opened this thread I thought it was going to be a hate thread about the dimensions (142-123-134) of the bentchetler. And then I was like whoa, Silence is such a legit guy I wonder why he is complaining. Then I realized I am an idiot and don't know a thing about mounting skis.
This means your screws were too long. You should have ground em down a mm or two. As for bit length, just hold em up to the side of the ski, if it looks too long, it probably is. This isnt rocket science. Use a 4.1 diameter bit.
Only use a 4.1 bit if it specifies to do so, otherwise use a 3.6. I would use a 3.6 in this case. It refers to the diameter of the bit not the depth, both 4.1 and 3.6mm bits will be the same depth. If you bubble the base its because they arent the right length screws (ie forgot the riser plate, non standard screws etc...). Use a 3.6 only use 4.1 on skis with metal in them or if they specify.......
I just used the stock Jester screws on my EPs, and I guess I just assumed I wouldn't have to grind them. Dumb move on my part, but I stopped before any real harm was done. I guess I got too excited to mount them and neglected a very simple check.