Awesome GT. Well done, ESPECIALLY on 30lb leader - or was that meant to be 130lb? - whatever it was, that is a massive GT. Congrats to you and also congrats to the photographer - that is a very nice photo.
If you're interested in confirming your guess of it's weight, I reckon Damon Olsen of Nomad Sportsfishing Adventures would be more than happy to give you an estimate if you emailed him the pic. That's a good pic of the fish and he'd be able to get a fairly good idea from that photo. He is considered an expert in the feild of BIG GT's. Check out his website:
http://www.gtfishing.com/GT%20Homepage.htm
His email address is:
info@nomadsportfishing.com.au
Again - well done.
Cheers,
Rob Mc.