Who is running scrimmages in mid-season? Now that I think about it, it's probably to get some competition during the holiday break when there are no games on this team's schedule. Makes sense.
Anyway, my advice would be to try to be a little more patient on the whistle. The players can do things at this level that high school kids can't do. Give them a half-second more to do it before calling a foul. If they can't make the play or the ball comes loose, then you can still make the call.
Go over rule differences before the scrimmage with your partners.
If you don't do a lot of 3-whistle, then worry about officiating, instead of positioning. The positioning will come. Make sure you remember to call your area.
Communicate.
Good luck. Hope it goes well.
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