People arguing with Loramin should realize he's only making a fuss because he's had his a4 camp stolen one too many times by pesky gnome enchanters. As an aside, let's not ignore the fact that shamans greatly outnumber enchanters at those camps in PoM (as well as many other "cash camps" since charming can be so incredibly tedious).
Back on topic, there is no in-era evidence that the charisma stat was not used in the calculation for charm duration. In fact, we have evidence of the contrary from comments made by the developers themselves. The EQemu guy argued that Zatkin, the spell designer, was somehow mistaken about the charm spell, but there's a recent interview with
Zatkin on youtube that I think shows how conscientious and meticulous he was working on EQ. He even speaks to how from the very beginning, McQuaid and Zatkin had envisioned enchanter's charm spell to be especially powerful in the game. I think that's quite telling.