Isaiah 53:5 speaks of a suffering servant being "Wonded for our transgressions and bruised for our iniquities." It should be clear to any reader that someone is bearing the consequenses of another person's misdoings. There is clearly an exchange (imputation of guilt - imputation of righteousness) here just as there is in 2 Cor 5:21 and Rom 8:2-4. Being wounded and bruised sounds quite "punative" to me! Christ took on the form of sinful flesh and for sin, condemned sin in the flesh - how exactly was sin condemned again?
I was reluctant to answer the questions because they were "loaded questions" that you had set up knowing that they could never be answered to your satisfaction. I have already conceded that perhaps I am not understanding PSA from the strict historic and Calvinistic standpoint that you are coming from. It is my understanding that PSA stands separately from Calvinism and a Limited Atonement and you say the two are inseparable. I still do not see it. With the way Dave described it, I am beginning to wonder whether I truly am a "Calvinist" after all!

The best I can offer is to give a biblical explanation of what Christ accomplished with the atonement of which to me sounds a lot like PSA. Perhaps what I am describing is not PSA at all but if what I am describing is solidly rooted in scripture and you still do not agree, then there is a problem!
Just one more thing though... What was the deal with the cup that Jesus wanted to be passed from him in the garden of Gethsemane?