I think your biggest problem is your short draw length and the fact your shooting a high poundage bow to boot. I don't think the blackhawk vapor whitetails you are shooting are ever going to get you where you would like as far as spine ratings. They are too stiff with your short arrow length. If you had a 29" draw length then your in the money. I would try to get i little lighter spine around a 0.400. seeings your arrows are so short. It may seem like they are too weak but most people that shoot that high of draw weight usually have longer draw lengths.I am not sure if your bow requires 6 gpp like your archery guy said but i do know most require a minimum of5 gpp not to void warranties. I shoot axis FMJ and they are pretty heavy at 11.1 gpi so they might be an arrow to look at if you need to get yourweight up. Another thing that may help is leave your arrows a little longer like maybe 26.5or 27". It will help weaken the arrow the longer it is. The arrows you have will work but they are too stiff for your setup. Better being stiff than tooweak. You could always try an extremely heavy broadhed 200grain to try to get the spine rating you need with the arrows you have.