You have the right idea on the plead call, use that only when they are flying away from you or are off in the distance and you are using it as an attention getter. I usually mix the growls in when they are overhead or mix it in with my normal clucking. When the geese get closer, if possible, have one of your hunting partners "cluck" if thats all he can do, great. If you have ever listened to a group of geese when they have more geese approaching, they seem to be in a more excited state, which you want to portray. So when he is clucking, have him speed it up some, trying to sound excited. If you mix your honks in with his clucks, you should have almost everything taken care of.
When I say almost, and I might be jumping more into this than I needed to, but make sure your decoy spread is set up according to wind, blind placement, etc and also, if you haven't used a flag, start now. It might be one of the single most effective attractants known to goose hunting (in my opinion).
Besides that, just listen to what the geese want to hear. Some might want a bunch of calling, others might want one or two honks. Normally when you are calling at geese, the lead goose will do a lot of the talking, so listen for her and replicate the type of calls she is making.
Sorry about the ramble, anything else, let me know.