Think one of those samples sounds like its' got some reversed samples of hte hoover going on. They both sound a touch more gritty than yours. Your's is quite fun though ... i'm enjoying it - you hardly need the turd polisher or anything! You could just sample the thing and chop it up a bit and see what happens, try something with a bit more grit ... play with teh release control in real time. I had one with different attack curves depending on velocity once.

maybe someone else will have some clearer ideas...