Its coolermaster hyper212 LEDif you've dropped 15C at idle that's a HUGE improvement, be pleased with yourself. As with all things, it depends on how cheap the cheap cooler is, and which one it was, some of the cheap ones are very good, but from those numbers it looks like your's wasn't
The only thing that i noticed is some cooler did not tell the maximum tdp of processor that it can handle so it bit confusing.my deep cool is 250 w tdp .last time i decide to get ls720 360 which is 300 tdp but i cannot find it online store offline store did not sell it.as far as I know that's not such a bad cooler, but I'm no expert (everything I know about coolers I've learned in the last few weeks), but you've switched to an AIO so cooler performance is no longer dependant on case air flow, and your thermal paste might not have been new
15 degrees is still a grand improvement for that upgrade