Most of these suggestions seem like single player suggestions, to be honest. There is not a super uber vasari fleet. The truth is is that you do what works. On a medium to small map, spam Assailants. Those come quick and with very few structures and upgrades, which leads to a decent fleet fast. Enforcer/subverter are for larger map battles that give you enough time to get them. Typically, anyone who has enough resources to build five military labs and tech to enforcer, start making them, etc, or makes multiple caps, has a huge map or noob opponents. If you aren't fighting in the first twenty minutes, then you're not playing multi or playing multi on a map that's too big for your game.
As far as RA, I had a match that was pretty much won from a few mistakes our opponents made, so I tried it out. It's soooooooooooo damned expensive and time consuming to set up that anyone who complains about it needs to update their AI difficulty or step into the online arena. RA is NOT a viable option without a super good team supporting you the whole way through, and only pays off after a while of having it going. Anyone who says otherwise probably plays games where 8 caps are a viable combat strategy. lol.