I'm a Mesa boogie alembician too, although I don't have the big meaty amps. I use a Walkabout 300w head and have 3 of the newer style powerhouse cabs. 2x10, 1x15 and 4x10.
Those cabs give me a great sound whether with my mesa head or my F-1x, SF-2 ,qsc component system.
I've read in the past people mention that mesa boogie cabs don't throw their sound weight very far from the front of the cab very well. I have not experienced that as I've not done loads of gigs with my setup and usually i'm close to the rig. Any view ?
I can't imagine FC_spoiler having that problem
Jazyvee