Hmmm, that's got to be frustrating!
I suggested the coil spread and tighten.
Obviously it didn't do the trick, but did it have any effect at all?
Are you using an insert?
When you say that you can't get a consistent temp, do you mean the temp on your box is fluctuating?
Have you used this box and coil on a different nail with positive results?
Maybe the box/coil is no bueno; do you have a thermometer that can read your nail? (I don't).
You say that your dab doesn't sizzle, does it "boil" and bubble?
That always seems to indicate proper temperature to me: dab, liquefy, boil and bubble, cap, milk.
IIRC you were on the torch and this is your first enail?
Torching might have generated more visible vapor, are you getting high when using the Liger?
Sorry for all the questions, I just can't come up with something concrete that will cure your ailment.
The proper carbcap will help, but it sounds like you're getting a good seal with the make-shift carbcaps.
Maybe keep increasing the temp on the box until you get the results that you want.
Perhaps the temp readout is bogus.