need some opinions on temps

well right now im using a rosewill z3 cpu cooler with a 120mm fan of my own, and im just not liking the temps, i used to have a bigwater 735 wc loop until it caught fire inside my comp(it was the cathodes, which are gone now),
i know the pump still works and ive been wondering if it would be worth it to run just a cpu loop?, for better temps. i would only need to buy new coolant and tubing(i actually have a 90% full bottle of fresh TT coolant, might just add distilled water to that afterwards)
it would have TWO SEPERATE 1x120mm rads, a drivebay rad and a external one, a dual 3.25 bay res, the squarish looking TT pump (400+-50 L/H) and the crap TT half copper cpu block. all 3/8th tubing. maybe go with tygon?

Overkill, but yeah, it'll lower your temps.

2 rads for 1 cpu, and the cpu only?

Overkill, but it'll all be good.

yea im thinking of going pump>cpu>rad>rad>res

i tried pump>rad>cpu>rad>gpu>res a while back and it leaked because of the pressure, it was a good lesson learned

any good way to clean out my cpu block without opening it? i have an air compressor and about every household and automotive cleaner available