How to choose the correct hardness silicone for my products?

Normally, different sizes of silicone mold should be selected according to different product features.
For example :

For products size ( within 20 cm ) :
With fine designs, soft silicone is suitable, suggest 10-20 shore A.

For products size ( 20cm-80cm ) :
With fine designs, suggest 20-25 shore A.
With simple designs, suggest 25-30 shore A.

For products size ( 80cm-150cm ) :
With fine designs, suggest 25 shore A.
With simple designs, suggest 30-35 shore A.

For products size ( more than 150cm ) :
With fine designs, suggest 25-28 shore A.
With simple designs, suggest 30-35 shore A.