Item level cheese isn't the problem.

The problem is that out of 24 players matched in the group, there's a high probability that one of those players is leveling a job under level 60, doing the mandatory CT requirement for MSQ or has never unlocked any of the other Alliance raids.

What SE needs to do is move the 3 CT raids into their own roulette. It's not going to disrupt game balance to add another roulette so players can get bonus XP for jobs they're leveling while separating the one thing that's keeping the Alliance Raid roulette from behaving like an actual roullette instead of a coin toss.