Try /dl coolmanLOL and /lp 0 coolmanLOL ingame to make your previous sound change to your new one.
For the first thing you said I don't quite understand you, is there an anoying noise staying after the hit sound or something?
Also next time please make your thread's title a little more on-the-topic, titles like help aren't very handy, gonna change it for you now but think about it next time.