The secret is to just tighten them until they stop then a minute bit more.After awhile it becomes second nature.
Just rebuilt the doggy again this am, and it reminded me to thank you Dub.
You were right, of course - I think we cause ourselves trouble by worrying about leaks, and overtightening the tank to the base. There's no reason to, since it isn't holding any great pressure or anything. You only need to tighten it to the point of secure contact with oring, nothing more. Your advice made it easier to rebuild without a screwdriver in hand.
After spending a couple of weeks with this tank, I still really do like it. In all honesty, it doesn't
quite match flavor & TH of my KM3's, but very close - closer than anything else I've tried. And it is a great vape, nonetheless, as well as all the other advantages. I'm thinking of trying the SJMY version, with its slighly greater airflow, just to see if I like it that way the same or better.