What I did was install all of the optional updates (with the dock attached, of course). Following a reboot (with the dock), I allowed the device to reach hibernation, and it awoke in about 2-3 seconds.
I will keep check on it though; this being one of the most frustrating issues I've had to deal with using my SP3 - reboot city.
I am currently installing one more optional update, but it has some issues (KB3022345). It is not obvious that it has anything to do with the dock, but who knows.
While I do like the SP3 I find that I am dealing with too many issues related to power and booting.