Yes, your water is much too hot. Forget the pump for now. The biggest impact you are going to have is by cooling your water better.
The original Black Ice reviewed by BillA was very restrictive. A more powerful pump could make a significant difference if the BIX is equally restrictive or worse. However...
A heater core will get you a lower resistance to water flow in addition to more surface area. So, it will be using less of the head capability of your pump and give you a better flow rate through the water block which will improve the block's performance as well.
There are Mag-Drive pumps that can easily provide enough pressure and flowrate for your system. I'd suggest not spending any money on a new pump until you know a lot more about the issues than you do now.
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