Fantastic news. Are you seeing improvements due to the on-board FPU? These figures are approaching the performance specs of some rather pricey CNC controllers (KFLOP, to be exact), this is very exciting.
If you are looking for quiet fans, I've always found this to be a good place to look https://www.quietpc.com/casefans. Even if you don't buy from them, it's a good source for information on airflows, noise etc.
Thanks! I use this site for a long time. Last time I found on it a quiet nice Gelid Solutions Silent 4 for my previous kossel build.