Thanks for the video! Interesting.
Of course it depends on the skill of the builder too but a good PvP combat takes too long I guess.
Even Class 5 with current damage + ROF.
The issue with damage and Rate of Fire guys is just one: performance!
The higher the damage, the more block hitpoints need to be calculated by the engine = more lags. The more often turrets shoot the more it cost = more lags.
There is only one logical and wealthy bonus for lag: we reduce the hitpoints of everything greatly 
Then you have fast nice battles with less lag, I can promise.
But maybe we test Class 5 for the beginning…