(1) there is a possibility the capo isn't pressing the #6 string down, and the fret buzz is caused by that.can you determine if the buzz is in any position you capo or just one position.You say a new bridge-- do you mean a complete "new bridge" or do you just mean you have a new bridge saddle? It is possible that the a new bridge saddle is too low on the #6 side -- When you say "lower e" do you mean the lowest(#6) string or the "lowest" as you hole the guitar( presuming you are a right handed player)