Seriously folks. I promise you that if you clean the atty in a coffee cup filled with boiling water, stir it around good for 10 or 15 minutes, making sure you move the atty around to get all the air bubbles out, take it out and let it dry over night....you WILL NOT HAVE THAT BURNT TASTE. I actually do mine twice. Fill cup, place atty, stir for 10 min, remove, rinse out cup, pour in more boiling water, replace atty, stir for 10 min again, let dry over night.
As far as the "chad" is concerned, try putting the EMPTY tank on the atty all the way until seated, spin it around, pull out, removed the little end cap that is now pierced, remove the chad with a pair of tweezers, then either fill and replace end cap, or replace end cap and fill with syringe. I have done this to 3 tanks, and 2 attys (both working good with NO mod). I have no leaks, no nasty taste, good vaper, good flavor, and a tank lasts 5-6 hours.
When I first got my tank in the mail I DID just throw it together and use it without cleaning the atty as described...the taste was AWFUL, the vapor was minimal, and the TH burned like fire. After cleaning, and prepping properly, I couldn't be happier.
Volcano has a good video in their how-to section on how to clean the tank attys and prep the tanks if that helps.