Those links it looks like the cards are basically the same, I'm not a fan of the hybrid design though.
MSI also has an EK Sea Hawk X, nice looking card IMO.
For 5GHz and only 3000MHz memory, the only thing you should have to touch is the CPU multi and CPU vcore, the rest of the voltages won't need to be changed.
Your temps are not good for a delidded CPU though, what thermal paste did you use?
For 5GHz you should be 1.25V to 1.35V depending upon...
The Dominator Platinum Torque are pretty sweet.
I ran a 4x16GB 3200 kit at 3466 for a couple of months without issue.
Personally I'd steer clear of the Kingston.
Strix boards fall toward the middle of the road ROG series, gamer type boards. Decent OC features, but mostly target toward gamers.
Rampage is top shelf gamer, Apex is 100% Extreme OC with ROG badging.