Pay bidding question.

My anniversary day is the 19th of the month. I'll be going to year 2 pay and the big pay jump that it is. So I have a regular line and I assume that day's flown on or after the 19th get year 2 pay while any before that are on year 1. Is that true?

Now let's say I get a green slip. Those are paid at the end of the month if you hit the trigger. So to maximize pay would it be best to bid to have regular trips at the end of the month as much as possible and green slip at the beginning? Or vice versa? I ask because it's about 43% jump to year 2 pay.

Also how would this work if I was on reserve? I can't find this example as category change examples are on the first day of a bid period.

Thanks in advance.