We all know the pain of running out of red minor by now, so I wanted to see just how bad it is. I downloaded the ToDo Monitor to see what the usage stats are with nothing traited:
If it were dead equal (not realistic, but for instructive purposes) each would use 2279 stones. Which means red is 800 stones over average while blue and yellow are 300 each.
What I would suggest is go through the Red/Yellow and Red/Blue troops and swap the minor used. Flame Canon for example takes 60 minor red, 14 major red, 6 major yellow, 6 of each runic, 3 arcane. If you swapped that to 60 minor yellow you would bring each color closer to balance. If you did this for 4-5 troops each you would bring red down by 600 and blue and yellow up.