Hello ronsgirl11! Welcome to ECF.
Seems you've tried a few e-cigs and from what I see you are craving that small size. It gets expensive swapping around with models. You could always search the ECF
Classifieds and swaps or put a WTB (wanted to
buy) there for a kit to try out. I'd think you'd find one pretty inexpensive.
TW's price isn't awful by any means for their 901 kit right now... but personally I find the small cartridge of the small ecigs fiddly, and you really need to constantly be refilling or dripping. That said, you might also consider trying out a Tankomizer for your Inferno. Won't solve the ciggy size issue, but might give you that cooler vapor and great flavor you're looking for and is only about $12.
INFERNO - Tank-o-mizer
As for mint e-liquid, your best bet is to look at the
reviews on ECF. Taste is subjective and you'll need to know if it is a Spearmint, Peppermint or what exactly you'd want. I've seen good reviews on mint from V4L's Wow Peppermint, mint from Electronicstix and also (custom mixed) from TastyVapor and a few other vendors who custom mix. TV also has Tin Box Mint which is to be like an Altoids mint (very strong) and has good reviews.
You might be able to fix up some liquid (that you have and don't like much) or do some DIY with mint flavoring from Perfumer's Apprentice, LorAnns, Capellas or some of the other flavorings from various companies. Some of the mint flavorings can come off as medicinal tasting rather than refreshing, so you might want to add a bit of sweetener or vanilla flavor to your mix if you find it isn't yummy enough. There is great info in the DIY section of the forum:
DIY e-liquid and recipes get posted here
E-liquid Recipes
Oh, and congrats on your upcoming wedding!

Happy Vaping

Hellen