The twist isnt a bad battery at all but a protank knockoff maybe isnt that satisfying. If you have any budget id say youd get a lot more satisfaction with a cartotank setup. If youre really fond of clearos TBH i like the evods more than the real protank, its a warmer vape and it helps enhance the flavor.
If you are at all good at tinkering you should definitely also look into rewicking your protank heads with cotton, you can up the voltage a little and it improves the flavor and vapor quite a bit. That may cost you nothing and give you the edge you need.
They are pretty easy to wick, i knew it was possible and didnt even watch a video. Just used pliers to pull it in half, tweezed out all the wick. Then i used a twist tie wire that i pulled the wrapping off, pinched a thin roll of cotton from a qtip in it and pulled it through the coil and snipped the excess off each side. Kicked myself for not trying that much sooner!
edit: This long and detailed vid really covers the process of even redoing the coil, but if you skip into it enough and catch the part where she does the wick, its spot on. Wire is very cheap though so if you were curious at all its a great overall rebuild tutorial
[vape] Micro Coil and Cotton Protank Evod Head Rebuild - YouTube