It's got a brand new genuine maf. Only about 2000k's since I put it in.

How much does the exhaust factor in? It's the stock exhaust but it's in pretty bad shape.

When I know it's about to overboost, if I really put my foot into it and max out the dawes valve, it doesn't overboost, or at least takes longer. Taking this into account, I've just gone for a drive where I closed the dawes slightly and opened the needle a bit. I got slightly higher EGTs but they settled quite quickly... I didn't have any limp mode issues, maybe it was just a lucky day, maybe I'm on to something.

I think it's just going to take me a while to get it right. Like I said, it's a new motor with new turbo and a few other things and it's just slightly different than the previous motor so it's taking a while for me to get used to it...