Questions on Shellac

I am planning t use some shellac to finish the inside of a cabinet I am building. Just to keep it simple I plan to use Zinsser Bullseye Amber Shellac. My understanding is it is 3# cut. I also understand from shellac.net that 1.5# cut is the best to use for applying with a pad.

Zinsser reduction directions are as follows:
3 lb to 2 lb 2 parts alcohol to 5 parts shellac
3 lb to 1 lb 3 parts alcohol to 2 parts shellac
2 lb to 1 lb 1 part alcohol to 1 part shellac

This being said through interpolation I get 26.5 oz of alcohol to 32 oz of shellac. My logic tells that if the quart is 3# cut to get to 1.5# cut you would add a full quart of alcohol to get 1.5# cut.

What am I missing? How would you get to 1.5# cut?

Thanks

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Questions on Shellac