Good to see you're getting things worked out
When I put in new coils what I do is snug down on them as I feel appropriate and then put the atty on a resistance checker. Then I nudge each coil gently with a fingertip and watch the resistance. If I get the wires tight enough nothing changes. If the resistance does change I tighten that coil down a bit until it stops happening.
Occasionally a wire will become slightly loose after vaping it a while. I always use dual or triple coils in my atties. If I'm dry burning one and notice the coils are not firing up at the same rate when they are clean I repeat the process above. Generally I'll find either a loose wire, or with multiple wires per coil (twisted or Clapton) a short between the wires has developed.
Vape on