No problem.  It was a huge help to me as well.  

Well....when I ran what I thought were your number, there was no difference in the price of the 2 packaging sizes, but I see now that it is because I misread your examples.  I was using 1.25" and 2.17", not realizing you were numbering the scenarios....

I'm looking for an answer to the same question.  I ran your scenarios and here are the outcomes on the Shopify plan to 48236 ($7.34) and to 97754 ($8.21).  What are the numbers you are getting on the Basic plan?