I'd use inserts. I glue them in with hot melt glue and have never had one pull out on any target. I don't know what your arrows weigh to start with, but I'd try the inserts without cutting the arrows first, then start trimming as needed. Carbons are supposed to be cut with a special saw, but I have heard of guys cutting them with an abrasive wheel. Make sure you wear eye protection and breathing protection if you are going to cut them yourself.
I shoot a 55 pound longbow and draw 28" so my setup is different. I have been using 29" Carbon Express Terminator Hunter 45-60 arrows with 100 grain inserts and 125 tips. They fly great from my longbow, my 49# Herters, and my daughter's 45# Black Bear recurve (at my draw anyway). They are just over 600 grains.
Hope this helps.
Russ