Actually, Harry is exceptionally good at magical craftsmanship. Bob says most other wizards couldn't have created Little Chicago, for example. And most of Harry's substantive magical growth (tutoring Molly... being trained by Mab...) happened after he created LC!
I bet (for example) that if Luccio trusted Harry -- and Harry would put in the time -- she could tutor him to make new Warden Swords; in fact, once his mundane skills as a smith were good enough, I bet Harry's swords (even without Soulfire) would be at least as strong as Luccio's... of course, just getting the skills would probably take well over a decade of devoted work.
He's just usually too busy, with higher priorities (although that's likely just a lack of judgement).
But no... Luccio isn't likely (nor Harry) to be able to duplicate Angelic-caliber Soulfire! If she were that strong, Peabody would have fried his own brain when he tried to mentally-coerce her.
It doesn't really matter that Harry is talented at enchanting if he never does it.
Harry has this super cool ability that theoretically lets him do all kinds of shit and he's just like "What if my fire did more damage?" "What if my ice was harder?" "What if my illusions were slightly more realistic?"
He could be using Soulfire to do shit no other Wizard can do, but instead he just uses it as a crutch to make up for the fact that he sucks at being a Wizard because he's more interested in practicing his Parkour or building up his thews.