Just to give you an idea...
About the drag issue, this is an old X-Plane flight model error that we at IXEG discovered and reported way back in september 2010 Basically XP has it's fuselage (body) INDUCED drag wrong (very complicated stuff). We off course fixed it ourself for our 737 XP10 aircraft (which likely is the only one that has this right for XP10 btw). So, now that Austin finally (maybe) fixed it for XP11, the result is our aircraft is off on drag. You can (maybe) imagine how much effort, testing, analyzing and documentation it took us to discover and isolate this error and get it right. So now we need to double-check Austins fix and see if he got it right and possibly tune it back in where it's off. Kind of ironic