I have the Kerker K series 4-2-1. It's also loud. I recently repacked it and noted about 30% of the packing was gone/toasted. It did very little, if any, to hush it up. I forgot to measure the baffle when I had it out but the noisehole at the muffler end is exactly 1.5" so I'm pretty sure its not the comp baffle. I would consider my bike to be non-neighbor friendly but I have no neighbors that will be effected. I believe it was Sean I was talking to that mentioned a larger diameter can that allows more packing, quieting it down some and netting a deeper exhaust note.
The last time I lived in a neighborhood I had an HD guy living a house away, always coming in at 2-3am loud as hell. I politely asked him if there was anything he could do as we all wake up at 5am for work. I got the following gem "loud pipes save lives, man". I cant tell you how many times I saw him needing a jump start or some help shoveling his truck out of the snow, loading/unloading things et al. I sat inside with my hot coffee watching him struggle and it made me all warm and fuzzy inside. Not everyone is gifted with sight beyond self.
Thank you for having the decency to show respect to your neighbors and folks. It's a very classy move on your part. I hope you find a good solution to make everyone happy. Do post your solution, I'm sort of interested in how the larger can measures up.