Just want to say that I am another that had two Evics both lasted around 2 months, I dropped both maybe two to three times and the heads broke off. I then had two useless silver tubes and had to purchase two of what they call easy heads to use instead. I will not be investing further.
I also have an Innokin SVD, dropped often no problems, I have it since it came out over 7 months, I have a Vamo, dropped often no problems, I have a mini Zmax dropped often no problem, and I have the Innokin Itaste VV V3, dropped often no problem. I am disabled so I do drop the PV's often, I just think for the price that the guy is asking, you could buy new product and get better quality. My money is on Innokin product under $100.00 or if you are really smart, save a bit and get the Provari. I am not able to buy any equipment at all right now, but, when I can, I will get a Provari. The build quality is there.
I have to agree with Baditude and others here that advise the different toppers and working from that angle before doing anything else. You would be shocked at the differences between different toppers. The resistance of the coils, top coil vs. bottom coil, the clearo vs the carto-tank, everyone has a different preference and this is the best place to start. When you are more comfortable with the twist and settings, then look at the mods. You will be able to better understand what the settings will mean to your experience. You will also be able to understand rebuilding the coils.
I am not a techie, but I took the time to learn what was safe and bought the items that were safest for me to use.