Hi. I have been messing around with protank and evods heads now for 3-4 months. They are very tricky to get right.
In the UK, there is much love for "rebuilding" and people are encouraging everybody to do it, even new vapers of say a few days.
I am beginning to draw my own conclusions from many many failures. Unless the coil is tidy and the legs are 100% clear of unintentional contact with any part of the atomizer body, it's going to fail. Too tight, too loose, touching wraps, wrong size wicks, it's not as easy as some say.
I did a good one tonight, no burning/priming of the Kanthal wire, no special treatment of the wick (ekowool). Just an A++ wrap and extra attention to the path of the legs and the cutting of the wires around the base/bung.
If you are set on continuing (I shall give up once I have my $10 worth of supplies) then follow the advice of everybody who has theories....they might all be right. If I ever do more than two good ones in a row, I will try and identify what I was getting wrong.
Good luck.