Ok, answering my own question after some research. The measurements in the manual for the MS seem to be off by 1/2 degree! At least compared to Losi hubs on my setup station.
My XXX-S shows exactly 1.5 toe on both sides, when it's setup for 1.5 toe. The MS shows 2.25 (right around there) on both sides when setup for 1.5 deg (1c rear 1x front and 0 deg hubs). So, I'm going to swap in the 1b block in the rear and measure again.
This would mean the stock setup has about 2.5 rear toe in, or maybe a little more.... no wonder the car is so stable
Anyone find the same?
Mike