I read through the OP a bit and I haven't found this 6a setup,
6a [a] 4[bc] (6a [a] x n)
Negative edge in brackets, c bug hits into b bug and a bug bounces back for 6a juggle
It racks up like 4k minimum from an overhead, omit the c bug for about an extra 1000 damage, but smaller characters usually fly too high to juggle without fixing the timing on the a bug a bit. My combo game usually revolves around this and j.d set ups for basket ball since I don't have the 6c loops down completely, but bouncing your opponent over and over is just as satisfying.
Am I correct in saying that the j.d is better just because it recurses the opponent beforehand? Either way, more options is never bad.