Cannondale Aficionados / Owners

Despite loving it dearly my System Six has started to get the inevitable worming/corrosion on the top tube join between aluminium and carbon. It happened in a alarmingly short space of time, despite the bike having never been put away wet. I know it's not structural but it's kind of annoying. My options are;

1. Leave it
   
2. Sand slightly on the join and apply a thin layer on clear-coat top to try and prevent it getting worse
   
3. Try and remove all the clear coat around the join, clean up the corrosion and reapply clear coat
   
4. Take it to a professional painter, get them to remove all the clear coat and respray the whole frame either clear or with a custom paint job.
   
   

The only DIY carbon/clearcoat repair i've attempted was with some brake levers - which worked well but i'm nervous about touching the frame. Thoughts?

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