Silk Touch Procedsure

I have created the following procedure after several hours of looking around the MCreator Site and am so great-ful for all the support everyone puts forward. Thank you

Here is the question, when I have the slab doubled up on each other like a full block and I break it I only get the return of a single slab. Is there a way to make it that the slab returns double that of a normal double slabbed block?

Any ideas would be better then my nothing!