I haven't watched a whole lot of film in alpha, but I've watched some.
Here are things to look for / confirm:
1) I think sacks are lower because WRs are getting open pretty easily. There are a few reasons why for this.
...a) I think that route is being weighted higher than M2M in calculations
...b) I think B&R handfighting could be weighted more.
...c) I think that player strategies based on playing the fastest WR as opposed to the most technically sound one with adequate speed are going to be very exposed in this version of the code. (Try playing more 100 B&R and 100 M2M guys.)
2) I think sacks are lower because DL are actually under powered now that QBs make decisions as quickly as they should.
...a) Watch acceleration on DL. I think a high AC, high SP DL can still be disruptive, but if not, then that is the first place to look.
...b) Watch blitzes, especially overload blitzes. I typically use those against the run, but they may be effective now against the pass in moderation.
3) I think QB accuracy is a product of QB's being over generated in terms of Accuracy and Intelligence. If the generation scheme doesn't change, then I would adjust the parabolic up some. (Increase the magnitude of a in the -ax^2 to 3-5 times what it is now.) That will mean greater differences in accuracy from 50->70 and 70->90.