I am in a competitive fleet shard where you easily climb 20-30 spots every day to get to 1 and this is not enjoyable. Regardless if you use mirror, Profundity, Executor, there too much variables between all the counters and nothing is consistent. We have players running 10 battles to move 20 spots. Profundity can be my most consistent counter but it relies on crits and assists. I do not recommend the MK6 starting only because you have a high probability of timing out. It is very frustrating, I envy those in a dead fleet shard.