Axis Balance point??

I'm a new member with a new Axis SR in .308. I have completed the mods written about in this forum, ie forearm stiffening, cavity filling in stock and added a small washer in the trigger assy. I've also added a muzzle break. Now, my question is - - it seems that the rifle is a bit nose heavy and I'm curious if there is a optimum balance for a rifle? Or, does it all come down to how it shoots? I assume that some lead in the stock would cure the issue if there really is an issue. Thanks.