Lee, the only issue that I found while hunting with my 68" longbow, as opposed to my 60" recurve was the fact that I kept getting tangled up in the brush with the longer limbs.
Shot placement is still the key, as I have had arrows bounce off of hogs (dead centered a leg bone) and the next time they fall over dead with a shot thru the heart.
Your set up looks great to me.
Good Luck
Mike