i did a bit of limit break damage testing.

[Gamer3427]

Last I knew it was based on weapon damage and your level

Actually, it's based on the average iLevel of the party if I'm not mistaken. I'm curious to see the OP's testing data, because if the party composition wasn't the exact same each time, (IE: Same players, and no one upgraded any gear or equipped lower gear for spirit bonding), then their test data is flawed....

That being said, as a MCH, I only LB if either the situation calls for it, (IE: Adds are spread out and need to be killed, but I can line it up to hit the boss as well), or if we reach the point that it's pointless to save the LB but no one uses it because they're so used to someone else using it, (IE: LB will kill the boss, and we'll have more than enough time to recharge the bar before the next one). It's rare that I'm not in a party with a melee of some kind though, so for the most part my LB goes unused....