well first of all the Hatchet cam is not offered in 80%let off nor is the twin powers they are only offered in 65% let off

the peremiter X draw cam and the perfX cam is has a 80% let off but is a single cam system.

it could be grip,anchoring point inconsistancies.

If the cams are still in time and still shooting bullet holes thru paper you probably need to work on your form .