Even if you went to something like a 2115, you would likely increase arrow weight by 25% or so, but wouldn' t really gain much in the way of energy - certainly not near enough to offset the speed loss you' d get. I assume you' d rather stay around 250 fps instead dropping down to 220 or so? You would gain about 25% in momentum, but 25% more than a little bit is only a little bit more. Again, not enough to cover the speed loss.

I would recommend going to a 100 grain tip like the Steelforce or Magnus Stinger to get the most penetration possible with the energy you' re getting. If you really want more juice on the arrow, then you' re going to have to crank up the poundage.