as a new-ish captain who had exactly the same concerns.......
1. Trust YOUR judgement.
2. If in doubt, always default to the safe option, bu**er the accountants!
3. If in lots of doubt, ask your FO what he/she suggests. Gives a bit of thinking time.
In any unusual situation we'd all do something slightly different. Almost never a right or wrong answer. That's why we have pprune.......so we can have long protracted arguments afterwards.
oh and congrats, you'll love it!