IMO the guides are fine, you don't want them loose. 1.6 rockers take alot of clearancing to work right and cause extra wear, like I said in the past.
I don't see how you can set the valve lash accuratly with the engine running, almost impossible . IMO

I set mine with the intake off so I can see what I'm doing.
Good luck with it.

I now listened to your video, It sounds like the pushrods rubbing against the guide plates?
Can't believe Mopar went to stud mounted rocker arms and guide plates! chevy... I thought shaft mounted rocker arms was better??