Do you have a pic? Is there still enough meat on the isolator for the coil to rest against? I thought about that but didn't want to trim too much.
I trimmed mine the same way, I just made it tight against the aluminum to make sure the coil was on it. I considered longer bolts but figured with the little give in the isolator there’s a small chance they could work themselves out (which probably could have been addressed with lock tite).