I actually got a pretty nice idea from the Youtube comments, Using a steel backer for the two outer dies also. That way the bearing surface can be a simple metal bushing or similar. I may try that next.
I forgot to mention in the video, as it sits right now it’s a 4.5"CLR. I chose that at somewhat random, but also smaller CLR bends are a bit easier to design around most of the time. Increasing that is of course also an option if needed!