Where are you from in Washington? I'm in Wenatchee.
If you are looking for arrows for the 45lb bow, the 400 spine will most likely be way too stiff. If you leave the 500's long with say 200 up front, you might get close to 500 grains, but I'm not sure.
Axis are pretty light shafts. Beman MFX Realtree and Classics are also skinny carbon shafts that are heavier than the Axis.
The 400's might work for the 50lb bow, but once again, you will need to front load them and weight them up front.
Sometimes with carbons you will just need to shoot some and then get your length and tip weight figured out.
Hope this helps.
Brett