Custom/Hybrid Engine idles really rough

Location
Pa
I've been running my xs1000 for 3 weeks with an msd enhansor with no problems
this week I had swapped out the enhansor with an epic and also added a waterbox
When I first fired it up I noticed that it idles really rough. When I grab the throttle it revs fine. When it idles down I noticed it dribbles fuel out of the booster of the rear carb. When it idles down really low it kinda sounds like when a metal nose cone for a prop comes loose kinda a ringing grinding noise.
I checked everything nothing's broke or rubbing.
Many suggestions what to look for possibly a bearing?
 
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