Hmmm...Might need some additional input data. What are the chances you could get some length and weight data of the fish to see RW of the fish. I'm going to guess that there could also be some regional growing season differences that could apply here too as you pond will differ from anything in more southern waters. That's a 100% guess from me though based off of comments that I've seen from people being cautious applying the same principals from the southern zips to mid-west or more northern zips.
I can try to get some RW data over the next few weeks - everything I catch seems to be well fed....oh and there are zebra mussels so I'm wondering if the PS eat those? Not hard to catch a 9 inch PS which is pretty fun.
Not sure about the spawning habits in the lake - I know they just went through a spawn, not sure if they spawn again in the summer or not, I do know that in my small lake they spawned some time after august of last year when they were introduced.