Yeah, I guess I was thinking of a reinforced hose for higher vacuum applications if my stuff collapses over time, not necessarily stainless jacketed rubber hose.
In looking closer at the specs it appears the Gates PCV line I used (1/2" ID, Safety Stripe II) is rated up to 4.9 psi vacuum, while sub 1/2" ID is rated to 11.8 psi.
Not sure what sort of crankcase vacuum is generated in normal operation, but I haven't experienced any issues yet.