I installed a sight glass on my HLT and it keeps getting air bubbles in it which can't rise fast enough and every few seconds about a tbs of water squirts out the top! I drilled the hole for it as low as I could so I could measure small amounts of water, and I'm thinking that's why. The water is nowhere near boiling yet, it started happening about 30 seconds after I lit the burner. Is this common, and is there an easy solution that I'm missing? This is annoying.