Hhhhmmmm!
This is not a personal dig at you, merely an observation on tournament organisers and i'm sure that you will deliver all that you say you can. BUT if for any reason you can't get 4500psi fills OR it turns out that your reffing crew have only reffed the Eskimo Paintball League First Round, OR, OR, OR...
Let the players know before they arrive!!!
One of my biggest gripes about tournaments is when they don't deliver on their promises. Last three times i've been ballin' whether for tournament or training the promise of 4500psi hasn't materialised and that means i can't through all the paint in my pack and that pisses me off!
If i know that i'll only get 3000psi fills before i get there i can deal with it. If i know that toilets on site means a bucket in the corner i can deal with it... Blah, blah, blah.
Rant over! Sounds like a really good idea and 7 man is definitely the way to go!