But..... if you use a modern compound bow withh 65-70 lbs of kinetic energy. A fixed blade broadhead doesn't stand a chance. Penetration has always been fixed blade users battle cry. Depending on the quality of mech head you use, you can out penetrate fixed blade. Accuracy, tuning and cutting diameter advantages are a given.

Boy you lost me with this.
A fixed blade broadhead doesn't stand a chance against a mechanical??????????? Please explain.
Depending on which mechanical and fixed blade head I test against each otherI can get any result that I want with either style of head. Be it penetration, durability, cutting diameter, accuracy, etc...
Accuracy, tuning, and cutting diameter are most certainly not a given with either style.