How are your outputs set up in the MS-8 and what are they connected to?
Channel 1: FR High (2 Way) -> Amp -> X-Over
Channel 2: FL High (2 Way) -> Amp -> X-Over
Channel 3: FR Low (2 Way) -> Amp
Channel 4: FR Low (2 Way) -> Amp
Channel 5: RR (High Level)
Channel 6: RL (High level)
Channel 7: Sub R -> Amp
Channel 8: Sub L -> Amp
In my case I can use the amp gains and/or the EQ to adjust levels.
I've got my "quick and dirty" install done and will be tuning this weekend. Will be updating my other thread with the findings, and hopefully lots of TrueRTA data.