Has anyone here ever cut, filed or changed the lip on crankbaits. I have some deep divers with real big round diving lip and thought i might cut them to a square bill or coffin style. I know you have to be careful not to change the balance point and it may not run as deep but the advantage could be less hangups and a better action. If I keep it simetrical and take off small bits at a time I may find something that works. Most of the water I fish is not that deep anyway. Any thoughts?

if you take any off the bill it will change its diving depth.  But yes it can be done.  I have changed quite a few of mine, even changed the angle of the bill.. be prepared to ruin a few before you get it right.