hi JCD,
its no problem that u r getting over 100% utilization because u are taking some value of blocking. I think that the actual question in your mind is that how come carried calls be more than available ckts. It is true that u can never get more calls/traffic than avail ckts. But since u are using GOS u are in a way reducing the actual no of avail ckts.
hope that this clarifies ur doubt.