also...did a quick conversion...correct me if i'm wrong here, been awhile since algebra class but....
oz hops needed = (IBU X gallons wort X 1.34) / (%alpha acid x utiliztion)
from what i've read online, the CTZ hop variety is basically just columbus hops, not a mixture/blend. so figure about 12.2% alpha acid for columbus hops, and 25% utilization for an hour boil and 5 gallons of wort. so....
oz hops needed = (10.5 x 5 x 1.34) / (12.2 x 25)
or in other words, .2 oz columbus hops (plus the additional kent goldings at flameout). i'm going to give it a shot and see how it turns out.