RayEels - This deck finds it relatively easy to deal with the PlasmaKlang deck - it already runs Fire Energy, so can freely use Benchtini to Catcher up and KO their PlasmaKlang to break the lock for long enough for your Rayquaza EX to start swinging again. How RayEels will perform against the rest of the format is a totally different question, so let's not discuss that.
Darkrai/Lasers/Hammers/whatever - It got Absol from Plasma Freeze, which looks to be a good addition to the deck in general. It flops around against some decks that don't really need a large bench footprint, but against PlasmaKlang with its fat bench filled PlasmaKlang, Shift Gear Klang, Cobalion EX and Cobalion NVI, not to mention Hammer disruption, Absol will easy get a 120 damage Mind Jack(or 140 with Dark Claw/150 with LaserBank/170 with both). A Dark Claw full-power Mind Jack does 140, which is enough to KO a Klinklang, though it does fall ever so short of a Cobalion EX KO(though if you got an early game Night Spear on it that they didn't wipe with Max Potion(why would they, 30 HP is pretty pricey to blow a Max Potion on)). The point is, if it doesn't get you while you're still a Klink, it'll just rip you when you fully set up.
Blastoise/Black Kyurem EX - Now this legitimately has a lot of issues with fully set up Klinklang. It contributes a Tropical Beach, which Klinklang certainly won't mind for set up, and its best attacker if it can't fit in a baby Keldeo is Blastoise. This is one matchup Klinklang has an advantage against, but to take advantage of it it needs to beat Blastoise in the speed game. I'm not sold on Blastoise using Vaporeon, but maybe it could use Plasma Kyurem?
Garbodor - Unless you get Cobalion EX ripping from turn 1 to get rid it of early Double Colorless Energy, Garbodor is really going to make your life hell. It breaks your EX protection, meaning you are no longer safe from a lot of the best attackers in the format.
Big Basics - This matchup seems a lot more favourable, considering it is essentially a deck that runs on EXes...except for the fact that it uses Bouffalant. It all hinges on how fast you can eliminate the Bouffalant from the equation in my opinion.
Plasma Basics - They have Plasma Kyurem for this exact reason(ok, and to deal with Landorus, but that's besides the point!). 2 Deoxys or LaserBank make this an instakill on PlasmaKlang, leaving the way clear for Thundurus EX to continue with its business. Additionally, one of the 2 finishers the deck can use, Snorlax, is non-EX, meaning it doesn't care about PlasmaKlang once it starts swinging(and considering their bench has 2-3 Deoxys EX, a full bench Teampact is doing 200-210, KOing anything, meaning it will finish the game in 1-2 attacks.