My experiences are pretty much the same as your own. I have no problem with penetration or accuracy with these heads...but the key is KE and a well tuned bow. Your signature shows that you are shooting a 423 grain arrow at 273 fps...similar to my own setup. I don't have a KE calculator handy but that should equate to roughly 70 ft. lbs of KE. I believe at least 65 ft. lbs of KE is needed to really get these 2 inch cutting diameter heads to function appropriately. They definitely are not for everyone but they are devastating with the correct setup.