base pay for the trip stays the same, and should be reflected that way in the pay summary you can view from your Monthly calender (or in the crew info section in VIPS)

you get disruptions in addition to the regular pay. but, cancelling a layover by making the trip shorter doesn't count as a disruption (25S.2.c.iii)

Canx the DH does count as a disruption and should get you an additional 1+30on the calendar

if it's not showing up automatically, the forms section on PFC has an eform that you can submit. ask for everything and more that you think you should get, company never seems to have a problem explaining to me why I'm wrong