Pete,
don't know if it's the best or not but I've done HBP a couple of times when arriving during the last half of the week. Tend to get a close to the front spot as the early birds are leaving.
Getting out quickly really depends upon which way the wind is blowing
If they're using 18/36 for departure's, being in HBP is a good place. If you have to taxi to 27 it's a toss up :.
Planning on arriving around 7-7:30 am tomorrow (Wed) myself in the 7A from Iowa for a day trip. I'll be back at the plane ready for departure by 6:30 pm and as long as I get off the ground by 8:00, all will be okay.
Doug