I recently added V&H slip ons and had the exact same problem. I use a Power Vision and ran several autotunes and almost got it all stopped but finally ended up sending my best tune to Jamie at Fuel Moto and he straightened it out for me except for a pop I get only at 22-2300 rpms when I let off. I sent it back over the weekend and hopefully he will get to it early this week.
When he did the mod to my tune, it stopped the fluttering and popping (except for the 22-2300 pop). Now it is a nice steady low sound on decal with no popping on gear changes.
I agree with the post to check your exhaust gasket and slip on torques and check for leaks.
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2013 FLTRU, Jackpot 2/1/2 Stainless Ceramic Coated Head Pipes, Fuelmoto Stage 1 Intake, Power Vision, Jackpot Full Size Ceramic Crossover, MADSTAD 16" Windshield, Motolight Running Lights, Nostalgic Rails, Airhawk R, Hayden Primary Tensioner, V&H Roland Sands Slant Slip-Ons