Having way too much fun with my 986S

[Idaho Red Rocket 3]

The Boxster is 986. I can't address question 1. #2 I have experienced and solved by using the slowest fill rate at the pump. #3 I used to get that code and the secondary air injection code until I began giving the car 2 to 4 minute warm up and keepng the revs between 2K and 3K until the temp gets up to 180 degrees. And always drive far enough to get up to 180 berfore shutting it off. Since using this start / warm up technique no CEL at all.