yes, I thought about asterisking my speed number, but I figured by now we all understand the error spread on GPS devices, particularly phones, which is all I have. the way I approach it is with relativity to previous runs. it definitely felt faster in places, but was obviously not the cleanest run. what was surprising is where it happened. usually my peak speed is coming into the trees of the jump into clearing, near the start (the first significant ramp). last couple runs, I've throttled it back up there because the ramp has gotten bigger, and the trail drops away from it. you can really get some sky under you on that one now, and I had a pretty good washout crash just before I got to the trees, several months ago. I like to be very sure about not touching the gravel on the outside of that bottom curve, now. this was maybe my third trip up there, since then. anyway, the peak speed yesterday was down in the middle, somewhere. probably on that g-out where I almost ate it.
anyhoo, last data point(s) on the headband thing: my buddy who uses the headsweat actually had a halo on, today. in terms of performance to it's intended purpose (keeping sweat out of your eyes), he says the halo is more effective. the headsweat is more comfortable. so there's the trade-off.
I find that the halo is most comfortable if you have the gutter strip positioned below the edge of your helmet, so it's not getting pressed into you head so much. this ends up putting the bottom edge of the neoprene halo band just above your eyebrows, which can feel odd, at first. I actually remembered this on the trail today when I noticed my head getting squeezed (and not between the thighs of some smokin' hot starlet).