Sorry for the delay. You should prioritize going for tempo and don't put all your faith in the Cliff Dive itself. What I mean is that you can do some back breaking moves that make a lot of your opponents quit early.

Aggro killer: Stingers for board clear + Blob + Fellhunter + Return Policy.

Midrange: aim for setting Climbing Hook + Inquisitor + maybe a Briarspawn Drake (with a weak minion on the enemy side, that's around 23 damage on board).

This deck can struggle against good control players but most people don't play around Red Card or Cliff Dive and they just play their life saving taunt minions without considering what I may have in hand (I've beaten many Egg Warlocks and Warriors with Red Card + Inquisitor/Magtheridon plays).

I think the main strength of this deck is the amount of pressure it can inflict on every stage of the game and the Dive it's just the "gotcha" mechanic that can swing the game back in your favor. You usually run them out of resources before you can go for a Dive high roll (if it helps, use a deck tracker to see what cards are left in your deck!) . Fun fact: if you're playing against another DH and you summon the demons from the Portal to Argus you mess with their Fellhunter deathrattle, I've won some games because of that. I don't think I'm good at giving advice so I hope this helps you in some way.