ORIGINAL: Simp
Something that I saw on TV recently was a guy using a Mojo, but instead of standing it up like one normally would, he leaned it forward so the wings just barely clipped the water. Definitely made plenty of ripples! Not sure if they're really supposed to be used like this or not but it worked.
The other thing that I have found very helpful with regards to Mojos is the optional remote control. Being able to turn it on or off at command really helps with late season birds, espeically further down the flyways.
The other thing I noticed this year is that the birds seem to shy away from them late if you are using the standard 3' pole. I bought an extended pole, which put the decoy up 10' in the air, and it worked like they'd never seen one before.... strange but effective.