I have collected tunes from various tuners accros the country, all I have seen are doing MAF only above 800rpms or so and disable VVE tuning above that. I run my car in MAF only with no issues. There are various methods to disable the DFCO, some mess the the RPM enable/disable, I just max out the ECT table. You might try that.
I recently have been posting up some videos on the tuning process I am using for my car. Maybe something in there that will help you. Good Luck.