I just tried your mod and I found it fun but also ran into some problems that made it less so. I ran into the bug that was mentioned in comments but also had a problem with the Fire lancer infantry. When I would try to close in they would still keep firing often right into the back of the rest of the unit doing more damage to themselves than to the enemy.

My two suggestions would be to alter the attack to either give it one or two shot but make it closer to an artillery range or maybe set it up to be a single-use ability that gives them a massive charge bonus with a minor explosion effect. But overall it is an interesting mod and I hope you keep working on it.

i wont change it to artillery range, since its meant to be a precursor weapon based on the historical chinese weapon. The fire arrow crossbow fulfil the artillery range weapon. Have you tried turning fire at will off? should solve your issue. thanks for the feedback, will definitely continue adding to the mod