Wicked mate! It is good fun. Way to make indoor riding much more interactive and enjoyable when it's a bit competitive. I'd do a race with you...your FTP/w/kg seems about similar to mine based on that ride!
I'm 88kg at the moment and 230 ftp. They gave me 111kg weight for the race, some top fast guys had 175kg etc!!
That's a great race to look out for. TBR (The Big Ring) Handicapp. Follow the instructions to get your handicapp (basically facebook page, enter details and about an hour before the race you get your handicapp - change your weight in Zwift to the handicapp weight)
Best bit is the guy running it usually does a youtube commentary video a couple of days later so looking forward to seeing that !!!
http://www.zwiftpower.com/v2/race.php?id=1741