Hearthpwn

congratz, i run a similar deck but still stuck in rank 4 since the first week XD the only diff is -1 haunted creeper + 1 secret keeper 

nd just like u said Truesilver Champion makes things alot easier agaisnt dragon priest..most of the time i play for rank is against  dragon priest, handlock warlock and secret pally.

i currently have a 60% against warlok, priest they beat me most of the time to be honest but when i win is thanks to Truesilver Champion and / or BoK and the mirror match to my op tbh is up to who plays Dr. 6 first 

Just give your deck a try on ladder again, atm there are also a lot of Druids and Patron Warriors. These match-ups seem a bit easier than things like Dragon Priest.

I believe Ragnaros should be fine though because it gives you value immediatly. The only issue is just when you have fallen behind on board quite a bit and you are watching out for a gamechanging topdeck Tirion is mostly the only card that can provide that value if it gets it deathrattle ability off.

But actually Ragnaros should be doing OK, hope i could help you! :)

With my secrets deck, I am on the edge of getting Rank 11, but then it puts me against Priests and Warriors. How do you push through when you keep getting knocked back 4-5 stars in a row?!

Against Priest Truesilver is a very core card, if you don't draw into it, you will probably lose the game. In both match-ups you have to play really aggressive from early on (e.g. instead of hero powering better drop something like another Haunted Creeper or Shielded Minibot) and then break through taunts like Wyrmrest Agent or Twilight Guardian with the help of Truesilver Champion. After you're really devastating turns 6 and 7 (atleast they should be quite pressuring) you have to hope for a Divine Favor to refill your hand and keep the pressure up with things like Tirion Fordring.

These things should make the match-ups a lot easier! Hope i could help you. :)

So far I have had some luck with this deck!

Great to hear that! =D