When I boosted the pressure I didn't change the concentrate flow and it went up some with the increased pressure. If I had adjusted it back down to .5 gpm I might have gotten 14% out of it. I was busy doing other stuff so I turned it back down to 300 psi and let it do it's thing. I normally like to run it at 250 psi and will do so when I go back to recirculating again. It gives me plenty of margin if I need to speed things up.
I'm glad that you made some nice syrup. Most of mine is either Golden or Amber with excellent flavor. People will buy the Amber but not the Golden. It's a shame because my Golden tastes just as good as my Amber just not quite as intense.