@spirit4earth I had only been paddling for less than 3 months, and on BIC hard board loaners when I ordered the 12'6 Race. When I tested, it was a dead calm day on Narabeen Lakes and I went like a rocket and the reduced width, 28in, wasn't an issue. I had gone to the demo dead certain of buying an 11' Sport! I was sold on the 12'6' and bought one straight away and the wife the 10'6' ride. Both were the first shipment of the 2016 versions, which are considerably (nearly 2kg?) lighter than the 2015 versions.
However, when they arrived we went down to Balmoral on a rather choppy day. After a couple of falls I thought "what have I done", but seriously, didn't take long to get used to a narrower body and to be honest I was still a beginner.
The 12'6 Race is not meant for surf and you'd have to have some skill to stay on anything larger than very small swell.
But that doesn't mean you can't get beyond the break and still paddle. That said, apart from the swell through the heads on Sydney harbour, I haven't tested it yet.
You soon find your centre of balance and I do enjoy the pace I can reach (though if your partner gets something slower you might be like me having to wait every once in a while for them to catch up).
Similar to you I'm around 70kg and the board sits well in the water with a large balance sweet spot where you can vary your positioning dependent on the conditions. I've found I can move forward or back by 6-12in to increase perceived balance and glide.
Anything above 15psi is hard enough, especially at our weight. I usually go to about 20. I suspect you'd only go up to 25psi if you were over 90kg
I can totally recommend the 2016 12'6' Race
And for the record, I don't race and have no intentions to. Just social weekend paddlers, getting out there with my wife and loving everything SUP!
The Reds are sexy too, there's plenty of board envy going on from other paddlers that's for sure!