Why the difference in pulling singles to pulling doubles?

I have a 2 grp Nuova Simonelli Aurelia in my laundry room set up so I can practice on it while I am waiting for the go ahead on my coffee shop in the Caribbean. When going from single shot basket to double I have to change the grind on my MDX grinder in order to get the shot to work. I have to make it coarser for the single and the finer for the double. Is this a typical thing or can something be done. I am sure I will be pulling mostly doubles but in order to try and keep waste to a minimum, if I only need a single shot then why not pull a single. If I have some ground espresso already in the grinder then it is too fine to pull the single and would have to get rid of that to then grind coarser and then lose the idea of saving on waste. Any ideas

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