You will need to use all five channels on that led controller because it can only handle 48 watts per channel. You will need to use 2 channels for the 6000k led's, two channels for the 2300k led's, and then last channel for the blue led's.
I would use a power supply with at least 175 watts at 12 volts.
The resistance of the led strips does increase from one end to the other. The traces that are printed onto the strips that carry the current from one end to the other create increasingly higher resistance from one end to the other. That increase in resistance causes a drop in voltage. Little by little as you go down the strip, the resistance gets bigger and bigger and the voltage gets lower and lower. But, unless you are wiring up multiple entire rolls of led's in series you won't see a noticeable output of in light across the length of the strip.
I would wire the sections of leds on each channel in series.