Ky, it really depends on your form, but I would guess that the 1 inch would not affect you too much, if you have decent form. The brace height generally does affect form flaws more than ATA length, but again, if you have a problem of canting the bow, this could also be a slight problem.
I will say that I am no pro, but my form is decent, and I shoot the same groups with my HavocTec, as with my Vortec. This is where shooting the bows before you buy them comes in handy.