Desipilot,
just a brief explanation of the factoring pay;
how you state it is not correct.
P1 or P2 does not matter, but bunk time is considered DH time (totaly stupid I know) and therefore counts only half towards your paytime.
In fact that means on double crew sectors your paytime is 75% of flight time and on 3 pilot sectors paytime is 83.3%.
Hope it helps,
Tom