I've seen worse (for airflow) cabling in a P180, if its ugly and it works - who cares?
I'd consider replacing that HSF completely, those zalman coolers are not wildely known for being silencer-friendly...
I really like my CNPS9500, it's whisper quiet unless it's cranked up good. I cannot say the same for the CNPS9700, that thing is obnoxious. I tried replacing the fan, since it's the one remaining source of annoyance for me in the entire machine but the replacement just wasn't pushing sufficient air when the system was under load. I had, up to that point, never touched the Zalman cooler while the system was operating and ever felt anything more than above-room-temperature warmth. With the SilenX fan on there, the edges of the fins were hot to the touch and I could feel the heat radiating off of it. System hit thermal overload and shut down on me inside 30 seconds under load.
It's likely that I'll just replace it with a closed-loop liquid cooler, but I'm also up for suggestions for air coolers... It's a serious pain in the rear (and the hands) to work inside the P180. I like those massive Noctua units but I don't know how I would go about installing one without totally removing my mainboard from the case to do it (I really don't like that the 1st gen P180 has no cut-out on the back of the mainboard but, oh well).