Thanks very much. I believe the 12 is the previous 1200 series from what I remember. And the # 1367 recommended by them as the HD spring for the loop has the exact rating that you mention, 90/130. Coincidentally, I'm also around 150-155lbs so I think these would work fine.
I'll check my price tomorrow but I'm in Canada and I don't know if any of our suppliers carry Ikons so I'll probably end up going with the Progressives.
I appreciate your help, your experience is exactly what I was hoping for.
Ken