If you want to make your rifle lpighter here is my suggestion : car stock instead of sopmod, eotech instead of elcan.
You could also bring the peq closer to the receiver, it will put more weight towards the back to make it less nose heavy. Not sure if nose heavy or overall weight is the issue here, or if weight is an issue at all
Tonnes of operators use grips, sling mounts, stocks, covers, BUIS etc.
Some CQB M4's have been seen with Troy sights, others Magpul polymer. CQD mounts are by no means "needed". I prefer QD's over hooks
The Elcan is very heavy. I won't run in with an elcan on course.
My "standardized clone" with an elcan and a loaded mag came in at over 10lbs.