Bruce,
Your Stage Floor mics worked GREAT for an outdoor play with my local high school. The speakers were about 20 feet in front of the stage and we had about 100 people attending. The stage was 50'x36' and the three mics picked up the entire stage (actors didn't talk much from the rear 1/3 of the stage, but they did use the rest of it). [We got] so much gain before feedback [as you said we would if the speakers are far from the stage]. People who sat in front of the speakers could hear the actors directly. I used an automixer for the three mics and it worked very well.
Regards,
Dean Stoneback