Why don't you just combine your data with Josef Ka to get there faster and help the community?
But it only does an ok job of estimating allstar players. And even then, sometimes there are weird results. Of course, this is almost certainly because most of the data points come from allstar potential players, but that's another story. Also, weird players who capped with a lot of outside d or inside shot would really help..
Tho different methods resulting in converging results would be most satisfying for everyone, dont you think? This is really a key project, more important than the simulation of ratings, in my view.
Edit: I can provide you data for a capped player in 1.5 seasons or so. Nothing for the moment.
How do the weird all-star players look like? What does their profiel suggest?