For one thing boosted cap with huge guns was 50% and unboosted was about
54%, this was before the increased the cap. The cap should be better now, but I
think the same thing still hold, 3-4% more for boosted gunners. So for this reason u
should boost them even they are at LVL 120, just makes u feel better.

And since ur gunners are only lvl 83, 653 total crew and the ability about 1815, u
could really use that 20% increase with the reload speed now.