You are pretty much inline with what I am using. I'm 27.5 and 80 pounds, with a 300 spine FMJ i'm either 525 W/125 or 550 with a 150. On my carbon shafts, I'm 600+ with 100grain insert and I like 200 spine.
We are shooting the 125 out to 100 yards with decent accuracy. Dead on @ 70 yards,and this is because we as shooters are limited in skill.....lol I have no doubt if an arrow hits bulls @ 70,why doesn't it @ 100 ? Because of shooter skill. I'm not about to shoot a hog @ 100 yards anyway,but did kill one @ 70 last week with a 125 on a 300 FMJ.
Provided you place your shot right where it belongs, this is what you will see. Your entrance will not be a straight slit. Instead it will resemble a "S". This is because the single bevel being sharpened on 1 side,causes a rotation. The S is showing that rotation.
Your exit side will resemble a "O" much like a hollow point bullet. Again this is the rotation. Blood will pour out and Stevie Wonder will be able to trail your blood.
2 things. Always presharpen and pre strop the heads,even out of the box despite them being hair popping sharp. The sharper you can get them initially, the better your resharpening will be later on.
Secondly, make sure your heads are screwed on very very tight to your arrow. These head will be rotating nd you don't want them to loosen and lose your rotation. I cinch mine down for all I got !
Enjoy and post up your results.