I've been having a bit of trouble with the throat hit on my iclear30. More often than not I get what I can only describe as a sharp, tingly throat hit. I prefer the thump type feeling when it hits the back. Sometimes I get this, most times I dont. It happens on both my iclears, and have since given up on my protanks. Anybody got any ideas on how to remedy this, or is this an unreasonable request?