n5296s
Which headset are you using?
Do you fly at altitude, e.g. 10k feet plus?
I think it's just continuous concentration. Though for the record I use a Lightspeed 30G in my plane, which I find very comfortable. (Hopeless in the Pitts though with the high noise level, there I use a DC 10-13X). I generally stay below 10K or if I go higher then it's a lot higher, with O2.
n5296s