There is no secret combination or setup.
What works best for one may not work very good at all for another.
Tanks and coils along with their wicking performance have to be appreciated for what they are... some are better than others for different reasons... accepting the pros and cons of each is essential. Not all tanks can wick high VG juice very well. Personally I find most of the off the shelf coils and tanks vape 50/50 VG/PG very well. Going higher than 50VG and certainly above 70VG will definitely start to give some tanks problems, especially if chain vaping.
You don't need a high power box or a special tank to have a nice vape.
I strongly believe a mod that can provide 30W is quite sufficient, in most cases.
A good set up for a chain vaper will be different than the major majority are looking for, imho. This requires tanks that can wick very very quickly.
I when I vape, I chain vape for about two minutes at a time.
My setups all provide a different vaping experience, but are also to my liking and work for me. I have come to terms with how they operate (coil and wicking performance) and respect that asking for more will provide poor results.
Below are my off the shelf setup/combinations I use along with the settings I use.
* Kangertech Aerotank V2, MVP2.0. Airflow wide open, 1.2Ohm coil, 9 Watts.
* Kangertech Aerotank V2, Itaste134, Airflow wide open, 1.2Ohm coil, 10 Watts.
* Aspire Mini-Nautilus, MVP2.0. Airflow wide open, 1.8Ohm coil, 10 Watts.
* Aspire Mini-Nautilus, Itaste134, Airflow wide open, 1.2Ohm coil, 12 Watts.
* With the above noted four setups I often find I have to wait for the wick to catch up, preventing me from a true chain vape experience. I really like these setups when I'm around the house... a vape here, a vape there, here-a-vape, there-a-vape... lol. I find no advantage to vaping these tanks above 12Watts since I will get dry hits more often than I like. These setups also have a very tough time with high VG juice.
My go-to set ups when out and about are below. They are customized for me and my vaping style.
** Kangertech Subtank (RBA mode) drilled and slotted, Eleaf 30W Istick, Airflow wide open, custom 30awg three wire twisted 0.8Ohm coil, 18.6Watts.
** Kangertech Subtank-Mini (RBA mode) drilled and slotted, Eleaf 30W Istick, Airflow wide open, custom 30awg three wire twisted 0.6Ohm coil, 20.7Watts.
** I intentionally modified (drilled and slotted) my Subtank and my Subtank-Mini to allow for maximum juice flow to the wicks. The modified RBA mode have allowed me to use high VG juice and has allowed me to truly chain vape the way I like.
As you can see there is no real easy answer for your question and concern.
If another purchase is a definite thing I think it might be good to consider a RTA. Building your own coils and wicks in a RTA maybe the solution.
Good luck.
Happy vaping.