First thing to do is Look and see what the load scaling switch is set to...that way you will know if you are still using %load or not.
And yes the MAF is the first thing I would work on. Make sure that all the adders/multipliers are set to 0 for the fuel and spark tables and turn adaptive off until you get the MAF dialed in to match what you have in the fuel tables at different load points. Do not add much boost until you get the load / fuel spark close. Then you can add a little at a time until you get into the WOT stuff. Just don't get greedy by adding a lot of spark and cause detonation

cool, thanks, I'll take a look at it here in the near future...I'll let you know.