I'm still new to all this, but after buying dozen tanks, I realize a VV Ego-C Twist is not enough- I need a mod. Pretty happy with most tanks, but the more I read and learn, it is becoming obvious that EVERYTHING is a guideline- There are no pat answers to anything due to all the variables- It seems each component has a personality. Change out a coil for another identical (?) one, and it's time to start playing again! New liquid? Now ya done it! Buy the latest 'Uber-Tank' with all the great reviews, and a $3 Chinese generic does better- Or not! At least this has been my experience thus far.
I think it's like anything else, the quest for performance takes a few $, time, experience, and lotsa fiddling. Luckily, it seems that the folks who don't want extreme performance are happy with a basic setup, and the hot-rodders have all sorts of things to experiment with so are happy with the abundance of variables and parts. I'm one of the latter, and must admit, the constant search for improvement is fun and most items are not very expensive. Having used these to go from 3 packs a day to 3 or 4 a day, it's LOTS cheaper and much better for me also, I believe. Cazan