Any reason not to do this?

Okay. So, a lot of you saw my recent threads on third member and axle nightmare. From what I've been told by Dr. Diff. is that my drivers side splines are misaligned causing axle to not seat fully. I have also surmised the small thrust button does not matter if it's still in. (It is.) Anyways, the guy who originally built the third member cut the axle off by 7/16" or so. His words. I am thinking well I've already gotten everything apart. Why not just narrow other axle and housing too? I of course realize this moves everything closer to the springs. Aside from that any thoughts of why this is a bad idea.