In your example you indicated that you live 99% by your calendar. If you are that booked up and your Next Actions really can wait, that is ok as long as you are engaging with your lists as much as necessary to trust that everything on there really can wait.

And that seems to be the problem - it seems you aren't trusting the list.

When I first started I put a reminder on my calendar to check my Next Action list and I did block time for Next Actions. When this time came around I looked at my lists and then decided if the best thing to do was some items from the list or if work had shown up that was more important.

Depending on the type of work you do, you may not have a lot of capacity for next actions. But then you'd better be sure that you are truly committed to the next actions. If not, they really need to be deleted, delegated, or moved to Someday-Maybe.