It could be any no. of reasons.
IIRC when i first went on to Stage 1 i was on settings B7 T5 F7 so that sounds about right
You could try lowering the fuel setting to 6 and seeing if you can up the boost then. To be honest though it wont gain you much going up one boost level - maybe 5bhp & 5-10 lb/ft.
If you want me to have a look at the logs just PM me and i'll give you my email