The trait called Diabolic Brilliance increases the Maximum spell gems but not the current charges of spell gems. I am not sure if this is intentional or not but the trait does not specify maximum so i think it could be a bug.
The next thing is with the trait Diabolic Link ( i think). if one dies and is revived it does not seem to calculate the stats correctly. For example horde currently has 600k health each, if one dies and gets revived it comes back with only 100k. Is this working as intended?