I may have to try the Mini. I have a Silo (Nautilus coils) and have been using the Ni coils from VS in the rDNA40. It's slightly better than kanthal, but not mind blowing. I still plan to make my own nickel coils, but the prebuilt coils can be convenient at times.I bought a Subtank Mini and at first I really didn't like it with the kanthal stock coils. It was sub par to say the least. When I took it up to 21 watts it couldn't keep up and was tasting burnt on a .5. I ordered some OCC nickel coils from Vaporshark to stick on my rDna 40 and WOW! The subtank mini with the nickel coils is amazing.
If I may ask -- what wattage do you have it at, and what temperature with the Mini and the TSC coils?