The point of synchronicity is to get donnybrook, nothing more. I find it more useful than praemunitus because the increased mag reduces the frequency of proc on duct tape mod and because it removes the full auto fire style on the hell walker. The 20% gun damage is still useful because you can maintain the sentinel drone. In addition your next few shots get the additional 20% gun damage after firing the mantis cannon, so it basically is the art of war on steroids.
The bore is extremely useful when coupled with duct tape mod and a singularity, as well as the dramatically increased amount of freezing due to our man Flynt. Don’t know what to tell you if you can’t get people lined up. Even then action skill cool down is basically instant for this build, so Sheer will has no value, the art of war requires you not shoot dramatically reducing your dps so pointless, renegade is pointless with salvation, deja vu’s ammo added to mag doesn’t really matter with the insane reload speed, so again pointless.
Cool hands 60% reload speed buff makes it to where your reloads are virtually instant, coupled with domino effect, reloads are a glitch in the matrix, meaning your mag size is basically completely irrelevant. Even then playing dirty isn’t really worth a damn unless you have all five and even then the returns are pretty poor, so why not?