AR 10 Timing and overpressure

[normandinpatriot]

Hello,
I am new to the DPMS pattern LR10 rifle. Not new to the ar platform in general and have shot for years. I have some questions about "typical" damage to brass after it is fired and ejected. but first lets start with a description of my build.

CMT Matched Billet Upper and Lower(dpms pattern)
Lantac Enhanced BCG bolt swapped out to JP high pressure bolt w/ JP firing pin
Ballistic Advantage 1:10 18" barrel (factory guaranteed -1moa) Mid length gas system
Heavy Buffers 5.5oz buffer weight and their recommended buffer spring
SureFire Muzzle Brake/adapter

Issue... After initially breaking in the barrel (only 40rd break in) using 20 168gn Hornady and 20 175gn Sig elite performance. These 2 different rds had some shell damage on the neck. Appeared to from smashing into the locking lugs on the barrel extension, but were otherwise pristine. The next batch of ammo showed signs of excessive pressure. I found online some Lake City M118LR. This ammo had ejector marks on the base, flattened,cratered, and popped primers. I had also purchased some Lapua 167gn as I do want to reload these cases for long range shooting. the Lapua ammo also had flattened, mildly cratered primers and some very mild ejector marks. At this point my Lantac BCG still had the lantac bolt and I was running a standard weight 308 carbine buffer and spring. After some research, and suggestions from shooters on another forum I purchased a heavier buffer and the JP High Pressure bolt assembly. These to things seemed to help, somewhat... the M118 still had some heavily cratered primers and the Lapua was almost as pristine as could be expected. I did just get an adjustable gas block but have yet had a chance to get out and test.

My real question is, can I expect to get rid of these signs with the gas block? or should I be looking for some other issue?