I have a Warmoth 5-string and a Fender Geddy Lee Jazz Bass, both of which have the standard "no-angle" peghead (where string retainers are needed to keep tension on at least some of the strings). The problem is, when I string up, I notice that some strings tend to bounce out of the frets. It isn't a lack of thickness, since I use mediums like the stock Fenders that were on the Geddy J. I think it is the angle that the strings are going from the pegs to the nut. The "A" slips out on the Geddy and the low E, B, and G slip out on my Warmoth. Any tips on how to stop this? I know they weren't doing that when I got them.