Why my index match formula is not working?

Column C (Box qty) and D (Box type) are my inputs here. Using index match i'm trying to retun the bin location (S1,S2,S3..etc) in column I by checking the Box type (810,811,911,822) and qty inside the table J to M which is pre fixed.

I used -1 in the end to get the next nearest lookup. Ex: ( if my box type is 810 and my box qty is 5 it should return S3 from bin location. I tried 1 before but it's returning the previous value S2. Could anyone tell me what's wrong with the formula or any alternative to return the next nearest bin location?

Note: If the box qty same inside the table it should return the bin location that is matching exactly, the qty in between two numbers should return the next nearest bin location.