Quite agree - I have had the same issues
- .... Many times over the years.
It's very simple to raise the header tank - one screw then move tank to the right to free it from two lugs, there is also a bleed screw in the larger hose found in the direction front to rear under/near the air filter box, although I very rarely find air here but it worth checking. Squeezing-releasing the larger house running across the top of the radiator also helps.