Depends on how much you weigh, terrain, speed, technique, rims, tires, and personal preference. Parameters/compromises with different air pressure come down to traction deflection, squirm, burping, small bump compliance, rim protection, rolling speed, and don't and likely front-rear balance...
Unsure if I'm assessing your issue properly or not...
Slow almost standstill turns require lots of bike lean. Think mototrials. If not, your front wheel will push.
This topic has been debated ad nauseum throughout the interwebs and time and space itself.
Clipless:
Increased efficiency
Makes up for poor technique
Allows riders to never learn proper technique
Keeps bike underneath rider when the track is unbelievably gnarly (think world cup dh holding...
Many headlamps have red lights. I haven't found one that is super bright. I have used them in the past backcountry skiing for ascents; however, switching over to high powered white light for descending.
Do the tracks change significantly from when the juniors race to the time the elites race? We may not be comparing apples to apples.
To clarify, I am talking about track deterioration.
Edited for shifty grammar
I think you are likely correct.
Looks like a sweet bike, but 12k. Ouch.
I'm not sure about the short chainstays... maybe with 29 rear wheel one is still relatively centered for turns.
I think you're both right. Intermittent braking allows for cooling periods resulting in a peak temperature closer to the average thereby avoiding boiling and brake fade. I could be wrong.
Same area under the curve for temperature vs time.
Reading between the lines here to OP. If you don't notice the lack grip vs squirming of higher vs lower pressures... and as stated the front dhf doesn't grip well...perhaps the following is occurring.
The dhf will drift in the no man's zone of intermediate bike lean. In other words, that tire...
Are you hitting any larger drops, flat landings, or big hits? If not then maybe leave the spacer in for when you do.
Does the fork feel harsh? If so. Try it without the spacer.
There is nothing wrong with not using all the forks travel as long as it feels good. If you take out a spacer you...
Traction. Intermittent purposeful braking unless, maybe, you're riding a perfectly even grade and surfaced asphalt road with no turns. Dragging brakes reduces suspension activity and unsettled bike balance as well brake fade.
This is pretty good advice. I'll add pressure the nose of your seat with your butt. In didn't watch the video however feathering your rear break could help keep the front wheel down while under power I suppose.
Once you get the fore aft balance correct with appropriate gearing it'll become easy.