Yes, removing a volume spacer is completely normal and a standard tuning move — nothing exotic about it. But before you go diving into the air spring, let's make sure you're solving the right problem, because what you're describing sounds less like "too many spacers" and more like "not running the fork hard enough into its travel."
Your PX Carbon runs a FOX 36 up front (Performance GRIP on the Carbon trim, Factory GRIP X2 on the Pro), 160mm travel. Here's the thing about volume spacers (tokens): they only affect the bottom-out resistance — the last bit of the stroke. They have almost no effect on small-bump or mid-stroke. So if you're only reaching 70-80% travel at 20% sag, removing a token will make it easier to use full travel, but it won't change your sag, and it may make the fork feel harsher/divey through the middle.
A few things worth checking first:
• Are you actually hitting big enough hits? Getting 100% travel should only happen on your biggest impacts of the ride. If you reach full travel on a moderate trail, the fork's arguably too soft. 80% on normal riding with the odd full stroke on the big stuff is a healthy setup, not a fault.
• 20% sag is on the firm side for a 160mm enduro-ish fork. Most riders run 15-20% on a 36, but if you want more usable travel, dropping to 18-15% sag (a touch less pressure) frees up the stroke more reliably than pulling tokens.
• Cycle the fork properly when setting pressure. As RickBullotta noted on here, add air in ~10psi increments and cycle the fork to equalise the positive and negative chambers — skip that and you can get a falsely firm, sucked-up feel.
On the tokens specifically: FOX 36s typically ship with one or two tokens depending on spec. Removing one is a legitimate move if you've genuinely got the pressure dialled and still can't use full travel on your biggest hits. Just expect a slightly more linear, less supportive end-stroke — and bump your pressure or compression damping if it starts feeling divey.
My order of attack: drop ~5psi first, ride it, see if travel opens up. If you're using full travel comfortably but the fork now blows through, that's when you remove a token and add the pressure back. Tokens are the last lever, not the first.
What pressure are you running now, and what do you weigh kitted up? I can get you closer to a starting number.
