Salisbury Nick said:

Notwithstanding everything that @Datatek said - who should be listened to most carefully - I had the same issues exactly as you first described them - and again, not withstanding the fact that multiple things can be wrong at the same time and compound a problem, after a lot of mucking about with my EAS over a very long time - replacing a faulty sensor eventually cleared all of my issues. At least for a while....

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Oh I fully intend to take a great amount of notice of @Datatek and anyone else, best way to learn anything.
Thanks for your input re the sensors, much appreciated

brianp38dse said:

If you remover the eas delay relay under the passenger seat it will not self level and will show if a bag is leaking that corner will drop
if there is a leak then the pump may well need a rebuild as it will have been working more to overcome the leak.

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+1. Rules out the bags at least.

Failure to go full height, certainly quickly, can be compressor wear. @kurtjohnson10 sorted me out a brilliant kit of parts for Otto. The new airhose was vital as the old one had split lengthwise, and even without that the output was weak.
That overhaul plus 4 new airbags has transformed the ride and handling. 3 new compressor mounts sorted the droning noise.
He very occasionally hunts for height or dances gently at traffic lights, but sorting some blocks and resetting the sensors should clear that.