Your looking at it from a strange direction. First you should forget about the 1v1 and 2v1 conjecture because that really had nothing to do with it. The big thing is how taking less damage = less healing required from the healers
It's all based of the fact that your basically trading HP for damage reduction, so from the healers point of view, that 5k hit becomes a 4k hit which is less healing needed in general. As long as the healer can keep you up, your max HP is irrelevant so an overall gain in survival is obtained.
Going back to the 2v1 issue, having 2 people hitting for 5k means the healers resources are being spent much faster then if you are taking 4k hits from both enemies.
This of course is assuming that a healer will actually strain them self out to keep you alive for a long period of time. If no such individual is around, then your max HP becomes a factor again.
If the OP is going to be solo queueing, half the time he won't have a healer anyway so your point is situational at best.
I wouldn't bother with Recruit gear if you have Rakata or Black Hole. Recruit is BAD. PVE Gear is BAD. You're probably not going to be effective in either gear, (especially if you're new to PVP).
People like to keep beating this topic to death and ignore the fact that neither set of gear is very good.
Full BM can take as little as 2 days to get depending on your play time. Even casual players can get it done in a week or two.
You're going to die a lot until then either way.