Runnung rough till warm then spot on plugs black

This sounds like your valve clearances are going out of adjustment.

Unless you have done something recently to the carbs. or the bike has been standing I wouldn't suspect them to be the cause of your difficulties. It's easy to think the carbs. are the culprit because however hard you try to adjust the choke you cannot get even running when starting and soon she is likely to start stalling at traffic lights etc.

Think what i would try first is a fuel additive to see if you possible might have gotten a little moisture or dirt in tank , I like sea-foam brand available @ advance auto or other auto stores but i would try this first and see results , black plugs could mean rich mix not enough air or moisture in fuel the latter is easiest to eliminate