RE: A couple of basic questions.
6ptsika,
Welcome to the forum.
I have used the Vapor ACA 4000 myself with a bow set at a 65 lb draw weight and a 31 inch draw length. I believe that I was marginal in terms of arrow spine....in other words I should have went up to the next size.
....but, since you are on the opposite end of the spectrum in terms of draw length the 4000 might be a tad too stiff for your setup. Putting that 125 grain head on the arrow might help the situation somewhat but only by papertuning the bow can you really tell one way or the other.
If I can find my Blackhawk Arrow Chart I will look into it further.