retorque heads to solve issue?

Yes, no re-torque.
Worst thing you can do with MLS or shim steel gasket is back off the fastener & 're-torque'. Cometic & probably others use a very thin polymer coating to seal the finished surfaces. You risk breaking that seal & getting a leak by backing off the tq.
You should probably call the guys that make them and see what they have to say before you comment since that is EXACTLY what they recommend. :BangHead: