I'm not quite sure what you're asking. In most gaming scenarios at least, the gpu is vastly more utilized than the cpu. You could say this is bottlenecking, but since the gpu is usually the most expensive component anyway, most would just say that the cpu is overkill for that task.
That's 100% correct.
No, I don't have any fans on the front side of the radiator. I oriented the fans like this so that the dust buildup that could occur will be easier to clean. The two fans on the radiator are pulling air in through the front. The top and rear fans are the exhaust.
That sounds like a good idea. I will probably try and add 2 more fans for push/pull at some point. Hopefully I can drop back the rpm if that happens, cause the fans that come with the Kraken are quite noisy. It's also worth noting that the load temperature is when using the prime95 benchmark specifically for massive heat. I never push the cpu that hard for my uses, and when using Cinebench (which is much closer to a general use case for me), the temperature can hover around 72 C.
The case that I used already has a fan hub on the backside to control the case fans. The rear exhaust is controlled by the Fury X, so I didn't need the wire that. The two top exhaust 140mm fans run to the fan controller on the back, which is powered by a CPU fan header. The front intake fans connect to the AIO pump, which attaches to the AIO header, as well as SATA power if I recall correctly.
Do you mean have both the Kraken x62 and 3 120mm fans as intake on the front? I suppose there's enough room for that, but I don't see how you could manage to screw in both as they would cover each others mounting holes. If you want to use the Kraken x62 and 3 120mm fans, one of them is going to have to be moved to the top exhaust.
You could probably fit the Kraken x52 (which is what I assume you're referring to) into the front without needing to remove the basement plate. I don't have any 120mm fans on hand to check, but that's what it looks like. Hope this helps.