There aren't a lot of options out there that are worthy when it comes to mini mics in the cardioid flavour. I've tried probably every known option except for the Audix capsules on a Church Audio cable but after many long discussions with several well-respected community members, I came to learn that the Audix Capsules <> AT853/c <> CA-14/c.
I myself have run all sorts of mini-mics over the past twenty years. I've run Core Sound Binaurals, Squidly Diddly, CA-14 omnis, DPA 4061's and most recently Countryman B3's (in the omni flavour). I've run SP-CMC-8 (AT-933/c) cards, CA-14 cards and am currently rocking AT-853/c's (SP-CMC-4's). Out of all the mics I've run, I prefer the 853's because they have a decent lower end along with a better mid-range pickup compared to the AT-933's (and AT-943's for that matter). I bought them because I can run subcard or card caps depending on where I am. However, the subcard caps are no longer available from AT directly (they're now sold out) and the 853's are harder to come by unless you want to by the SP-CMC-4's from Sound Professionals and pay an arm and a leg.
With what's easily and readily available, I'd _STRONGLY_ sugges the Church Audio CA-14 cards as an upgrade for you. As far as mini-mics go, there are limited choices available and I really think the CA-14's are gonna make you happy versus what you currently run. Check the Yard Sale for a "used" pair or look in the Retail Space for a new set from Chris directly. Best of luck.