I watched that guys videos and took his advice on the loose pedal hinge idea and it still didn't fix my problem.Hi Zach.
Right after hearing all of this stuff about the Vex I went and checked out some reviews, it turns out people have been having trouble with them, however the problems mentioned can easily be fixed without spending money and with a bit of manual labour.
They seem like great pedals for the money if not the best in that price range by far. If you buy one and have problems with it please look at this 4 part series on youtube
This guy is fantastic, he explains the faults he had with his Vex double pedal and he shows you how to fix them.
I hope this is of some help to you.