Amazed at you serious collectors & hard work. Some cool mounts there. GZ
I only have 80

Stopped raiding in Cata, TFW but came back to help on Raggy, Firelands 25HC then stopped, so I missed MOP & Draenor and well as you now know re-subbed recently.
Regarding myself?
1) Rarest Drop rate % whise, probly Reins of the Grand Black War Mammoth (on my 1st run back in wotlk lol) then Smoldering Egg of Millagazor I guess
2) Atm I use Grove Warden as it just feels right with my druid, but also still Icebound Frostbrood Vanquisher from time to time as I got that back in Wotlk when it was still actually hard and something special
3) I suppose I don't really farm mounts, but kind of feel atm I should do it a bit (any tips, guides?)
Only thing I have farmed somewhat over the years is Ashes, obviously with no luck.