Got them at 10 15 20 30
I would assume you are refering to your pin set up. This coulld very well work for you. You may want to try shooting at 10 and 15 with you 20 pin. I don't know what you are shooting for #, speed or arrows but I shoot one pin for 25yds and closer.
Should I practice with broadheads or field tips. With the blades on or off?
Get good with field points but definately shoot and tune you bow to broadheads before the season starts. You definately don't want you first broadhead shot of the year to be at a deer.
Just my $.02