what are the radiators manufacturer and model?
if you are running high 20+ FPI, the cluster is a lil timid on static pressure @ 12v.
like the GTX/stealth rads. the "looser" fin per inch would be a better alternatative
with all the surface area. the 480 and 360 will easily cover the hardware and the
240 (if used) can be used as headroom if in a high ambient situation or fan fail.
only your testing can really determine how low the fan speed can go without