why would you cut 1 in. off the back ?
Jeff answered for me.
IME carbons need to be cut from both ends to get the straightest shaft. Then I grind down the ends square to make sure components will fit as straight as possible.
If you have ever spun some bare shafts prior to cutting you will be surprised just how many will have a slight wobble on the nock end

And no tuning is going to help an arrow fly right if it has a slight wobble on the nock end