Honestly, the issue with ewar bots is not really able to be displayed in straight up comparisons of damage/tanking.

Ewar bots advantages comes from the ability to choose when and where to fight, and the ability to always run if you should choose too. Arguing mixed groups "beat" a enemy ground of all ewar bots is a completely valid point.

The real problem is that neither side can really kill the other. Yes, a mixed group should win in any stand up fight... but how many of these actually occur. In actuality, what happens is the ewar bot group runs, and any tacklers the mixed group might have either back off, or chase and get focused down outside of their friendlies range. They might win the fight by making the ewar bots run, but that still means you have a large group of ewar bots running around on your island. They still have the option of either leaving (with little to no loss) or kiting the mixed group forever, looking for targets that they can actually kill (winning in a comparison of NIC lost).

As long as one group of bots as a significant speed advantage this will always be the case. What does this actually mean? Ewar bots are the go to roaming/roaming defense vehicle.  Mixed groups are for intrusions or anything where there is a objective that the enemy HAS to fight you to win. This said, whats the best counter too a large amount of ewar bots on your island? Send a mixed attack group to theirs to screw with their ***.  Suddenly, you have stopped any mining/farming on their island, and potentially force them to return home to defend their crap. If they want to get you off their island? They either need to engage at a large disadvantage with all ewar bots or switch into their own mixed force. Suddenly you have that fight you were looking for.

I guess what I am trying to say is, you don't need to nerf the bot, just use some different tactics.