Any reason not to use a blow off tube throughout fermentation? I changed to no-chill brewing and use kegs for primary. Unfortunately my kegs with airlocks don't fit in my fermentation chamber I built for carboys, but they do with blow off tubes.
"If you ever reach total enlightenment while drinking beer, I bet it makes beer shoot out your nose."
-Deep Thought, Jack Handy
"Brewers enjoy working to make beer as much as drinking beer instead of working."