Yeah, Charmer currently feels a bit jank in a half there way I agree, half the time I feel like my Charmer would be better off just being a Black Mage that also picked up the Charmer nukes, since Black Mages tend to have high Presence to boost their summons anyway, and a lot of the witchy gear also boosts sexiness anyway.
Maxing out Sexiness on level 6 becomes easy enough that you end up wearing either armor or mage gear instead, especially since so relatively few items boost Temptation. The BFH from Berwyn's second quest was a big disappointment in this regard, it's next to useless to have that much of an extra sexiness bonus for Charmers since it caps out so easily, to the point I considered dropping my Presence below my Willpower just to get some Spellpower itself, but that felt even more counterintuitive.
Ever since Resolve was folded into health and powers that used to hit Resolve now just become health nukes, Charmers have felt very odd, and I kinda hope they'll just completely redo the class by now tbh. Or at least remove the cap on sexiness.