Those are really nice Bosch injectors. I've found very little variance in flow between individual injectors. They usually flow within 1% of each other straight out of the box.... no flow matching required.
Some people love the MAF and other people hate it. Personally, I love the MAF sensor. If tuned correctly it will outperform SD any day of the week. Don't believe all the BS about the MAF sensor being a big restriction in the intake. Your throttle blade is a bigger restriction... let's see you try and get rid of that too. I can see that you live in a place with cold winters... if you choose to run SD you're probably gonna end up needing a summer tune and a winter tune, and yes an SD tune will change that much between seasons when you live in such a cold place.