SuperStepside: Was curious as to what the potential fix to this was. Was gonna look at doing the exact same thing but not if there's going to be a "not sure" problem with going to cos5.
Try this adjustments to see if it starts this should help.
Guessing you have a 2 bar map sensor If not you need to change your scale
also guessing your injector info is correct
do a full flash and see how it does
I have has some where it does not fault the maf meter right away and they will act like that.
Your setting on MAF Diagnostics could of made it take a while to kick it to sd.
If you have no maf on the car it will some times not start because its reading the first line of the maf and does not give you enough fuel to start.
so if you bring up the bottom area of the maf some it gives you more fuel for starting so it can run enough to fault maf and run
I Have seen this many times even with maf setting to 1 some times they will not start ....
Yes, without a MAF DTC the ECM reads the MAF, so bringing up the MAF low cells gives you more fuel to allow starting.
MAF related thread: Cos5-help-after-loading-tune-car-wont-start-without-maf-plugged-in