I figured out my steering binding issue. It was due to excessive toe out. I knew it was off but it didn't strike me as the issue until I got to the final setup stage of the build.

What happened was I built the links using the manual's measurements, however the RPM ball cups were shorter than stock so all my links were about 4mm short.

I found a good way to get my front end setup without fancy tools, I'm sure most already know, but thought I would share anyway

1. setup servo horn to be close to zero as possible and attach steering link
2. subtrim until the link is as close to centered as possible via eyeballing against the ridge of the top plate on the right hand side.
3. use a ruler to draw two parallel lines on a sheet of paper about 30mm apart
4. line up the front wheels (this is assuming the links are already set to same length) on the line furthest from you
5. Lay the camber tool flat on the paper on the other line using the desired angle against the wheel. So just like you would measuring camber but flat on the table to measure the toe. You could also use a protractor to draw and/or measure the angle but I find the included tool in the kit works great.

It's a lot cheaper than a fancy setup station and $50 setup board.