I have a mds .48 that I am trying on a profile Pathfinder.  The engine puts out loads of power and spins a 12/6 prop easily.  Upright it runs great, same through all inside maneuvers, squares, loops, triangles.  Problems appear when I try outsides.  It seems to lean out some and by the third maneuver is barely pulling enough to get through the maneuver.  I tried adjusting the tank and that doesn't solve the problem.  I lowered the nitro from 10% to 5% and that helped some.  The tank setup I am using is a standard plastic clunk not set up for uniflow.  I have tried with with and without pressure and it seems to work best without although the Super Tigre needle has to be turned out almost 9 turns.  I am wondering if in the outsides the fuel is flooding out the plug.  Anyone experienced this problem before? 

We have tried 2 of the 49s rigged as both side and rear exhaust and have found that a 13 x5 pro Zinger clean up provides more thrust and flying ability.
Busby