I haven't really specialized a mid for making pots(i just use my HW's vesper), I used to also use a willow mini glasses for the int. I believe it's dex that factors more into your success than luk, but I'm not a numbers person and more a trial/error/theory person.
My djinn is DD, and I'd honestly not waste the money on a valk armor or a seperate djinn for pot making =/ I don't know anything about the lower mids you posted, or if we have them though.
And ofc you need to take into account marionette control as well, always dex over luk when statting that, so I'd assume it's dex>luk>int as the formula goes.