Wondering why there's is no 9.6 or 9.8 set grades?

Not sure what you are referring to.
CB has:
Standard Grades of MT, NM, VF, etc (none of which have a 9.x grading)
CGC : 10.0, 9.9, 9.8, 9.6, etc.
CBCS: 10.0, 9.9, 9.8, 9.6, etc.
EGS : 10.0, 9.9, 9.8, 9.6, etc.
PGX : 10.0, 9.9, 9.8, 9.6, etc.

What are you looking for or where are you not seeing what you expect?

please screenshot what you're seeing so we know what you're referring to

Like 9.6= nm+

9.8=nm/mt

No nm+

No nm/mt

If memory serves, you can create those grading categories and assign values to them, based on the assigned NM value.  Then, when the NM value fluctuates, your self-created category values will also fluctuate accordingly.

Thanks Michael just did that and works fine 

The only thing I will add, is if you try to sell on AA, the custom grades will be changed to official ones (not sure of the exact mechanism).

Hi Steven I don't sell so it should be fine 

Glad to hear it, Mark.  One of the things I've always liked about Comicbase is being able to tweak the database to match my wants/needs.