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I forgot how much these were a labour of love. Glad you got sorted comfysofa... did you end up going 550 on the rebuild?
Try the bike on a headstock stand, then a rear paddock stand see if it helps the air move up to the rad. Failing that you could try one...
There should be a coolant bleed bolt at top of water pump housing... If you've done all the above run the bike with that point as high...