Trim Tab Cylinder Failure

I appreciate everyone's input and observation, you have all made very valid points to consider.
I talked to Oliver at Bennett and he was frankly perplexed at the failures I'm experiencing. I am sending the broken cylinder to them and they will do an analysis. According to Oliver, even if one ram was trying to extend farther than the other, the ram does not have enough power to break the other cylinder. However, as you all point out, it appears that might be the cause.
I will get a new cylinder and then we will first disconnect the rods from the tabs and run everything up and down to make sure we extend and retract at the same rate and lengths. Then we will see what can be done about the differing heights and if that is a contributing factor.
So far the current broken unit has broken twice and the port outboard cylinder has broken once.
I'll follow-up when I get more info.