[sjf911]

I don't quite understand what you meant by your leak down numbers.

Worn valve guides will typically cause smoking on deceleration and idle while driving, not so much at start up. They typically won't affect compression or leak-down unless really bad.

The valve failure risk comes from loss of contact of the valve stem to the valve guide resulting in lack of heat transfer, I don't think frequent oil changes are going to help there. There is a good chance that one or more valve stems will be worn out of tolerance as well and need replacement (not that costly).

Once you suspect valve guide wear, I would not delay as your risk of catastrophic failure is rising. I would also recommend replacing any worn valves even if still within tolerance (I would personally replace them all).