There isn't a synthetic that is modeled after the original close enough for all the parameters you seek.
The Ram Line is probably closest to the original length of pull, I believe those most recently were made by Champion...they are also the lightest of the aftermarket stocks.
The ATI is heavy heavy heavy....and the LOP is probably akin to your Choate. Butler Creek, while I have never had one, has one of the best reputations, but also longer LOP.
I am surprised your Choate doesn't fit well, I have one of the dragonov type stocks, and it is by far the best fitting aftermarket I have ever used....those you can adjust the LOP by removing a series of spacer pads behind the buttpad.
There is also the Bell and Carlson, which you likely won't find without a couple years search, but I also believe those have the longer LOP.