Roller cam idle RPM

I would say run the lash twice a summer if you dont notice any changes when you check it.
On the cross over mod... it's not for the lifters at all. That mod keeps the volume up for the #4 main bearing (and therefore the rods it feeds) at high rpm. Nothing more. I was curious how you had a cam that large with the stock lifter nores...lol. I guess custom lifters would do it.