Yes i would definitly re-talk the agreement. If your the one taking care of the class with no help from him, then you should be entitled to fair compensation. Plus your class is bringing him more buisness, its only fair that he pays you fairly.
I have an Ed Parker Signature line uniform from Tigerclaw, and its a very nice uniform. Has a nice stonewashed color and heavy build. The only problems I had was with the strings on the jacket (then again i'm the instructors dummy ) And sometimes it seems to limit my moveability a little bit. But overall its a good uniform.
Try to avoid ground fighting in general. If your doing it in the dojo, then its good practice just in case, but in a real situation, the ground is the last place you want to be.