this is what i use/do.... i'm no expert.
22LR suppressed SBR (IR laser if hunting at night)
FoxPro Shockwave w/ custom calls. i have over 200 on it, i think.
Mojo Critter decoy
this is what i use regardless of season/time of year/day. sometimes i spice it up, but its pretty much the same...
start quiet with a baby raccoon call or baby raccoon distress.
after a few minutes go to adult raccoon distress.
after a few minutes go to raccoon fight.
after a few minutes go to hardcore raccoon fight.
sometimes i will raise/lower the volume or pause a minute or two in between calls, but sometimes i won't. just depends on how i feel. a stand will last up to 20 minutes. its usually shorter than that.
you gotta stay still and have a decoy. place the decoy on the opposite side of the tree, away from the den. don't move! if they see you, you're done. i have called den trees and have one sneak up behind me. its crazy sometimes. sometimes coons aren't interested, sometimes they aren't home. i think it all depends on their mood, time of day/year and other stuff i don't even know about.
good luck. its fun, especially at night.