You need to upgrade your tanks! The SubTank Mini with the new OCC coils is amazing!! Once i started sub ohm vaping, i could never go back to my Protanks and Aspires...My review of Miniprotank 3 compared to the Aspire BVC...
After I don't know how many months, I have come to a final conclusion.
The MP3 is quite simply, superior. The BVC seems to not properly 'vaporize' the liquid, you always feel that there is some liquid rather than vapor reaching your mouth and throat, and I notice that with the BVC I wake up in the morning feeling the 'smokers throat'. Furthermore, as the battery on your ecig drains, the BVC becomes exponentially worse, while the MP3 holds up quite well.
That's my opinion about it at least.
Subtank Mini with iStick 50W is a good starting point before going in the rebuildables.
PS. 8 Months without a single analogue cig!