RE: Arrows not flying straight?
You really can't beat feathers for controlling an arrow, and rain problems are blown out of proportion. Carbon Express Maxima series of arrows have been the best all carbon arrow I've shot.
There are a lot of things that go into making a great arrow, spine, proper component assembly, adequate fletching, as well as adequate FOC.
Post up specifics and I'm sure you'll get some Good advice.
Dan