My elo is no where as good as yours so take everything I say with a grain of salt. I started playing league when fizz came out. I played a lot and by the time I hit thirty, the meta was solo top, ap mid, jungler, and ad carry/support bot. I've played all of the support roles that you have mentioned, with all different champions as my carry. After getting bored with every single combination and their ap and ad variations, I started thinking that I could cure my bordem by taking my support rune page,tweaking it slightly, ading it to a ad carry page or ap carry page and churnning out new completely viable support characters. These combinations you must duo que with. If you are not on the same page they will fail.

Caitlyn carry Nidalee support

I love this combination. The long pokes they both have along with Caitlyn's ultimate, makes them a harassing nightmare. Hitting a caitlyn trap and then being hit by a spear is never fun. There are traps everywhere. Caitlyn has an escape and as soon as nid hits 6 she has pounce. Nid can put traps on caitlyns traps to give the extra damage and armor/magic reduction. There are many other reasons that this combo is amazing. But there are some others I want to throw at you.

Ashe carry Lux support

Morgona carry Teemo support

Ashe support Graves carry

Let me know if you have tried any of these or anything out of the ordinary.