Derek, Having done a good bit of angle work I've run into the same thing you did with wheel gauges. I have to say that I'm not being critical of your work here because it may sound that way. The wheels are just not large enough in some cases. I tend to use a cutting gauge in those cases. I think I did hear somewhere that there are larger wheels available. That would be handy in this case. It is fun to explore the unknown and figure out how to get things to work as you have been doing on your build. It's almost as much fun to watch as it is to do it.
Jim