Amendment: I'll probably have to turn sceneries on and off still. WIII (BDO payware) to OTHH (Taxi2Gate payware) and I have 600MB left as I began descent into OTHH. I suspect FlyTampa Dubai sucked the life out of VAS by flying near it. So, I save, I select my LH Cargo B777F, reload (still get the visual model anomalies I have described in another post), reload the plane, and coast on down with 2Gig of VAS available! I end up with 1.3 Gig of VAS available as I touch down at OTHH.
So, "FIX" is still DX10 and Steve's DX10 fixer, but most of the advice from PMDG in the pages I refer to in my signature still apply. So, DX10 Fixer is not quite a silver bullet, but I get WAY more VAS overhead/legroom than with DX9.