"And how about this as a plausible explanation for why Paul went and told Peter what he was preaching- they'd never met before, and all the disciples knew was that Paul was no longer persecuting them? Seems like a very plausible explanation to me. :)"
Possibley the explanation to you, insignificant part of the explanation to me though.
One of the chief features of this explanation, besides being completely supported by Scriptures, is that it requires absolutely no doctrinal deviation from the historic Christian church's views as it has absolutely no doctrinal impact. I said it has Scriptural support- try Galatians 1:22
Building an ark is supported by scripture too, but I doubt you think it will support you or anybody today should one decide to build an ark the next time the Mississippi threatens your part of the country or 40 days and nights of rain is forecast.. Lots of things have scriptural support, but often will not support ones use of it. Trusting in the Historic anythings views is not what we should be trusting in either sntjohnny.
The Gospel Paul preached was not the same he persecuted, and I have scriptural support for that as well..
galatians 1-11 But I certify you, brethren, that the gospel which was preached of me is not after man.
12For I neither received it of man, neither was I taught it, but by the revelation of Jesus Christ.
The gospel Paul preached was unknown to him when he was persecuting the message you say was the same.

And for some scriptural support for Paul preaching one way to the Jews and another to the rest, try......1 Cor:19 For though I be free from all men, yet have I made myself servant unto all, that I might gain the more.
20And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;
21To them that are without law, as without law, (being not without law to God, but under the law to Christ,) that I might gain them that are without law.
Oh my, this late in the game and Jews Paul went to were still under the law. Do you think Paul had it all wrong and that those Jews he went to were Not under the law? And did you notice, he went to those not under the law as well?
He didn't say they just thought they were under the law either.
Hmmm, what would you like to do now, find some early Historic Christian teachings to use against the scriptures?