Something you can try, I don't think this is the proper way to do things, but if you are out of ideas you can play around with it. Just be careful with this, because it could throw everything else off. The nice part of rigging is you can disconnect things and line up holes. You can disconnect the 36" rod from the intermediate bellcrank, rotate the input lever to reverse, and with the coordinator at 0 degrees, find out what isn't lined up. Just be careful, you adjust one thing to get reverse to line up and it might throw other things off, but it might give you some insight.
Also, make sure it pins in feather. If the 36" and 24" rod aren't adjusted properly, they won't give you the entire spread needed to reach both holes, as the 36" and 24" rods push and pull the bellcrank which rotates the input lever through the 6 1/2" rod.
Just an idea, just make sure you rig from the rear forward, otherwise you will chase the problem back into the engine. Rigging is definately one of those things that you just have to play with, but it is how I would go about this problem based on what you have done already. Good luck!