The Bx6 SBS is unusual. First, the route doesn't have an existing limited route to convert to SBS, unlike the Bx12, M15, B44, or B46. Second, the local route will stay, unlike the M86 or M23.
IMO the B82 SBS should continue on Kings Highway past Flatbush unlike the current B82, which turns right. Then the B82 SBS should turn right on Glenwood and continue the whole way until Pennsylvania Av. This should be done for both directions of B82 SBS, and anyway, even if the B82 retained the same route, would be much faster for SBS riders since Glenwood has fewer routes and bus frequency than Flatlands.
If a LIC route is being converted to SBS, how about the Q69? The only thing is that in the north, it parallels the M60. Looks like the most logical choice though; the Q102 is right under the Astoria line, and the Q103 and Q104 basically hug the shore, serving a smaller area.