Quite a bit bigger than Jr then.

I just watched the video of it and it didn't look too bad, its not going to get the same sort of force as a FP flipper is but if its getting people over at least then thats a good sign. I noticed Jr had trouble flipping robots unless it was just under them and they were near to the ground. I think theres a video of my trying to right Jamie's MDF bot at Edinburgh and because of the unusual shape it was when it was upside down it couldn't get at it properly.

So maybe its just the limitation of the system? If not, test the setting on the reg as at the highest for your system and similarly for the PRV.