Adding weight to the back of the arrow does increase spine, but also decreases your FOC, so there are trade-offs. Needless to say I have learned alot since I started this thread. Just for some closure, this is what I ended up with for my arrows.

I am using Easton Axis 400's. My arrow lenght is 28.5" and my draw weight is 58 lbs. I was actually shooting with 63 lb draw weight, but had to back it down because I was underspined with that weight. With 125 gr tips, I came in at around 405 gr for a total arrow weight. I may be off a little on that number, I don't have my info with me at the moment. I plan on going with the 340's next season so I can bump my draw weight back up. It's not necessary as I am shooting very well with the current setup, but I want to try for the "perfect" setup. Besides, building arrows is a lot of fun (BTW, I ended up buying an Apple arrow saw).