SloperZ

The turbulence causes extra air flow around the MAF which cools the hot wire faster. This makes the engine think it is getting more air than it is. Moving the MAF farther from the recirc and/or turbo decreases the turbulence and gives a more accurate air reading. Putting a 90 degree bend in the intake piping between the MAF and turbo should also help this problem.

I had my MAF placed too close to the turbo and recirc from the blow off valve and I was having a lot of trouble once the engine warmed up. I moved the MAF about 12 in. farther away and put another bend in the intake piping and the problem was fixed. This may be worth looking in to.