I think you have talked yourself into the decision. Go with what you feel best about.
However, I agree with the comments about the 8'3" - it should be fine for you in a range of conditions. Don't get too hung up about volume, so long as there is enough to float you stability is driven more by other factors such as width, plan shape etc than pure volume.
....Or you could buy the whole range and have a quiver of X32's then your worries are definitely over!