Oh, Phil, you are shooting your bow at 30 inches with 55 pounds of draw. That is pretty close to AMO specs. The AMO speed is 223, I would think you should be able to shoot faster than than that because of the lighter arrow. I am going to take a guess at some where around 240 fps if the advertised specs are correct. That would put you right around 50 to 55 ft/lbs of energy. That sounds low to me for a 30 inch draw though. My Yukon does close to that with a 26 inch draw and 60 lbs. I think they are fudging the IBO spec a little. Let us know what you find out.

And the difference in speed between the 100 and 125 grain head won't be that much that I would worry about it. I would go with what ever gave you the best spine and foc.

Paul