Had same experience with my 140 RLC’s on my Zesty. There is a solution which goes like cutting a shaft giving the fork a more linear stroke. Too much oil in the air chamber can also cause this problem, however I would call this a general thing with those older Fox forks.
Now after a couple of years of riding, with much more experience I’m glad I didn’t do the shaft cutting hack back then. On my Lyrik I prefer it not to use full travel. When all of that travel sinks in those legs you just get real awkward head angles. Once I had a good couple of psi’s less in the fork and I hit the brakes late before a bump. First brake dive, then hitting the bump with much less travel available was real scary at that speed. I prefer it sitting high in it’s travel. It is important to maintain the bike’s geometry.
I’d say just leave it as it is.
With the speed increasing you’ll notice you need much more damping. At local trails my Lyrik R is perfect. When taking it to the bike park speed is so much higher I have to pump it up real hard to avoid it collapsing on bigger hits. This results in some unwanted harshness on those braking bumps before berms. This is when you consider the DH damping unit or a coil fork with separate high and low speed compression settings.
