OK I went out to Wal-Mart and bought some of the Peaches & Creme white yarn. Tried one piece in place of the top wicks in my Protanks and while at first they worked great I soon had flooding.
Cut another piece and added one to each Protank head, and it is perfect! No gurgle, no flooding, no hot juice hitting my tongue. At first the taste was very subdued, but within 10 minutes it was back to normal, and just shooting clouds of vapor! A definite winner there! No boiling or anything, just straight cut and vape. Good stuff!
Update: After vaping last night and all day today, 24 hours straight, often chain vaping, I have to say that this is great! Not a single gurgle or flood of the Protank, no burning of the wicking! Nothing but great vapor and taste, and this yarn is now my number one to reach for when I have to rebuild, and this one 109m ball of yarn should last me a long time.