Breaking the Tactics Barrier.

It's like the sound barrier in the years just before Yeager broke it: Planes were going so fast that their controls locked up and they ended up nosediving into the ground or disintegrating in the air.
It seems to me that I've hit a bit of a wall with dual tactics. Seems like I get more out of them if I don't max them out. I've tried builds that should theoretically ram, strafe, avoid, or repair to their full potential. (I've got the XP to go 10s on both tactics, and between 8 and 10 on Courage, Speed, and every other stat.) But it seems like they lock up and don't do anything after a certain point. Is there such a thing as tactic/stat overkill? Is there something hidden the code that requires preset stats to unlock a character's full potential? Am I just tinker-happy and not giving characters a chance?
It seems to me that I've hit a bit of a wall with dual tactics. Seems like I get more out of them if I don't max them out. I've tried builds that should theoretically ram, strafe, avoid, or repair to their full potential. (I've got the XP to go 10s on both tactics, and between 8 and 10 on Courage, Speed, and every other stat.) But it seems like they lock up and don't do anything after a certain point. Is there such a thing as tactic/stat overkill? Is there something hidden the code that requires preset stats to unlock a character's full potential? Am I just tinker-happy and not giving characters a chance?