I found a solution for the burning taste and the reason it happens.
I dont use ego-T but 510-T its the same system..
basically what happens if you power up the PV and the wick is dry you will burn it, one time is enough.
from that point it will taste burned, so what you do to fix is simple, you pull out that middle pin with the wick inside (its the HARD part especially on 510-T becuase its so small, takes me about 30 minutes.
After you pulled it out you'll see black spots on the wick, wash it gently and remove the burned spots by rubbing them with fingernails.
Do not fill the tank 100% full, leave 1/8-1/7 ..
When you connect the tank with the atyy, stick a toothpick in the tank hole you'll see some juice leaking out and its good, then connect the atty. (If you wont do it sometimes it can form an air bubble above the hole and the it wont wick then)
before you vape on it, pay attention that air bubble raised up to the top, then its safe
I have clearomizers ver 4 and 5, dual coils and 510-T IMO the tanks have betetr flavor, for some reason if I vape from cleromizers i get same taste from all juice and almost zero flavor, only when i use brand new clero it vapes normal but on second refill i get no flavor