Asymmetric didn't really work, low tier always wins. Probably would have been smarter to test several options like 7 v 4 and 6 v 4. You could have run all bot battles to figure out the possible configurations before sending it to test.
I like Epoch because it gives a reason to play lower tiers which are fun but since all the rewards are for tier 5 and higher there was never a reason to play at these tiers.
Lastly, you are testing too much at once an thinning an already small test population. Be more focused if you want good data and people to come back to test. Being the only player against all bots is not going to keep me coming back (yeah you can tell I'm not playing at prime time).