Surely, anything that restricts fork movement is just wrong?
We are not talking about a bit right at the end of the stroke before the fork bottoms out, from the above figures we're talking a full 2''
What is the fork travel, 150mm?
I did measure it once, I'm sure it's quite a bit less than stated, 130mm rings a bell.
Take 40mm sag (90mm travel left) take away 50mm (80 compressed gaiter - 30 free space with stock height forks) = 40mm travel from usual sag before being restricted by the gaiter.
That just sounds wrong to me.