I know this is an old thread necro, but I found a solution here in the differing opinions that worked very well.
I bought thick PBT keys, NPKC brand, that had binding issues on backspace, enter, shift ... the usual stabilized keys. I ended up finding a solution by using a rat-tail file and filing down the front inside of the keycap. It took a few tries to get it right, but now every key is buttery smooth.
Hopefully this helps someone out. I would not recommend bending the stabilizing bar as that would not help the binding issue.