Thanks Dave ctbram. The UVs are relatively the same size. I have separate checkers for 1k, 2k and 4k UV maps. I started with the biggest UVs (Wings and fuselage) to determine the max pixal density I can get and then grouped the remainder of the UVs into the 1,2,4k groups to get consistant pixal density accross the different parts. I just have not adjusted the UV coverage factor on the three checkers. They are still at the default 2x2.

I think I may need one 8k texture for the bump map of the main wings. I did some experimenting and found that I get jagged edges with a 4k bump map on the main wings. Any other way to smooth lines in Maya or Photoshop without going the 8k route?