Okay. The way I saw your picture, it looked like the color was below 7.4. That's the problem with showing test results in pictures. The colors are all going to depend on the screen's color settings. :^s
Yes, Nitrifying microbes do better in alkaline water with 7.6 -7.8 being " optimal" for most types of nitrifiers.
As for the shrimp, there are a few that can live in alkaline water. That said, having shrimp will put a real damper on what fish you can add in with them, especially if you want them to be reproducing. A 75 gallon tank is really a big tank for being constrained to a limited fish selection. ( IMO of course.

) Many people keep shrimp in smaller tanks like 2 to 15 gallon tanks. Also, they need pristine water which makes having fish in with them a lot more work. Your choice of course.