I have an 09 vstar classic 650 Put on Vance Hines short shots installed...

I have an 09 vstar classic 650. Put on Vance & Hines short shots, installed recommended jets and a K&N filter. I did remove the baffles though. The bike is now backfiring when decelerating and is burning fuel. Anyone have any suggestions?? Tried adjusting the fuel and idle but still having the backfiring as well as seeing the flame come out the pipe but only the short one. I'm lost and frustrated and just want to ride but need to make it run right. Would putting the baffle back in give it the back pressure it needs to be right or something else? Any help would be appreciated.

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