Cam and that pump and fans are designed for variable speed operation, there's no point in running the pump at 100% for idle as an example, the cpu isn't going to care if it's 32°C or 34°C.
My X61 I just set for Silent mode, temp by coolant not cpu and let it be, regardless of actual reported temps. And that was a i7-3770k at 4.9GHz OC.
As the coolant temp rises, so does flow and fans, according to the curve, which moderates the temps, which is what coolers are for, not trying to obtain useless maximum lows.
Maybe you're thinking of water's exceptional capacity to absorb heat? So at a lowered flow, it just starts running hotter (absorbing the heat still) so faster fans would remove it faster? That's interesting theory...and maybe a thermodynamics engineer could figure out that relationship.
Yes and no. As the coolant is forced across the microfins, it picks up the transmitted wattage given off by the cpu. The lower the flow, the longer it takes to move the pressurized coolant across the fins. The cpu is still dumping the same wattage, but the coolant has a far higher capacity than the cpu has output ability. Take a pan of water, put it on the burner on High for 1 minute. Temp didn't move, even though it just absorbed 1500w for 60 seconds. Same test, 2 minutes. That's 3000w total, nothing changed.
But, that still really doesn't affect coolant temp much, nor change cpu temps. What does is the transmitted temps to the tubing, the fittings, the piping in the rad. As they get warmer, so does the coolant, eventually. As the coolant heats, it looses a little efficiency, fans/pump move faster to compensate.
That wattage is carried by the coolant, but has very little affect on the liquid. When it hits the heat exchanger (rad), that wattage is absorbed by the metal fins, and turned into heat, which the fans try to dissipate. Faster the fans, more air is moved across the fins surface area, higher the rate of dissipation. Upto a point.
But there are points of uselessness, same with an aircooler, above a certain amount of wattage there's nothing to dissipate. Like having a D15 at full blast on a cpu at idle, turning it down to 50% makes for zero change because the first 30% is all that's necessary, any rate above that doing nothing but create noise.
So Cam was designed to lower pump speeds, lower fan speeds down to that point, being just enough to efficiently move the wattage from the microfins to the rad. Aesthetics. No point in running maximums with all its noise or potential noise, for no reason.
If you open a program and the temp jumps to 70°C, then settles down to 55°C, so what. Same temp, almost identical cpu performance. Having Cam set for cpu speeds means an instant ramp to 100% (default for 70°C) and 3 seconds later that drops to a more moderate % for the 55°C. If Cam is set for coolant temp, no ramp at all. Pump and fans don't change speeds because the coolant hasn't changed temps.
Coolant usually hits max somewhere in the 40° to 50°C range, and starts at case ambient temps, so somewhere around 30°C. That gives only a 20° range for change, so in affect is quite sensitive, just not fast to change, can take a half hour to go from 30° to 40°, especially in the bigger coolers with higher coolant volume.
For an aircooler, a jump from 32° to 34° is negligible, aircooler having upto a 70° ish Delta (cpu 30-100°), so 2° is a measly 2.8% change. Nothing really. For a liquid cooler, a 2°C hike is a 10% change in temps (30-50°C coolant) which is significant.
So fan/pump speeds will raise along the curve much faster than an aircooler, having a far lower curve to move on.
All of which means just set Cam for Silent or Standard and stop worrying about the exact cpu temp, you have a liquid cooler not an aircooler and as long as temps stay within safe ranges it really does not matter what they are.