When I use my older Provari, which is seldom these days, I've never had any problems with using any of the Protanks or Aerotanks on them - I use 1.8 ohm single coils.
Haven't tried the Protank 4 because I've found the one tank that I really like and I've been stuck on them since then. Don't know if you remember back when I used to use the HH.357 exclusively because of the vapor production and the flavor. Could never find a tank that could even come close... until Aspire put out the Triton. The first version was great for two tankfuls and then it crapped out on me and I couldn't get it to work no matter what I tried and how many times I pulled it apart. The Triton 2 (second version), fixed all those problems and I've been using these exclusively since. There are all kinds of different materials in coils, different resistances, etc. but, with my vaping style of mouth to lung and liking a little tighter draw, I stick with the kanthal 1.8 ohm coil.
The batteries I use are the Eleaf iStick 50W for the most part. In wattage mode, I go with around 9.7W - 10.7W depending on my mood. At the lower 9.7W, even chain vaping, I only have to charge the thing once every four days or so because of the 4400 mAh capacity. Just recently got an iPower 80W TC with 5000 mAh capacity that I'm liking a lot. I don't use the temperature control, just in wattage, but that keeps me happy. I like simple.