Alneyan, it's no typo. I intentionally use the term "multislayer" to refer to MP games more often than not. Because, as you said, that's what they are.
Cohen, you can get Missile prot from Silver Hauberk as well, or from Shield of Valor. Your GW is no high end SC, but a more than adequate low end one when you kit it out and use it in conjunction with support troops. The fact that it got stomped by a high end SC means absolutely squat because its greatest impact will be against indeps in early game expansion. Last I checked, you don't get anything like that with indeps.
Zen's mod takes care of the rainbow pretender frailty issue, and many of your modifications are ridiculous, there is no end run around that fact.
Edi