Good Afternoon, 

Thank you for contacting the U of M Extension Service. 

We are volunteer Master Gardeners and Tree Care advisors. I am not familiar with all the specific hybrids of a Korean Maple. 

Here is a link to the Missouri Botanical Gardens about Korean Maple: https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=275369

This information states: Easily grown in moist, organically rich, well-drained soils in full sun to part shade. Performs well in full sun or bright, sun-dappled locations. Avoid hot and dry sites. Site in locations protected from strong winds.

So from the get go, you have clay type soil which is not "organically rich, well-drained soils".

You might consider doing a soil test before you decide what type of tree to plant: https://extension.umn.edu/managing-soil-and-nutrients/soil-testing-lawns-and-gardens This link has all the information you need to do a soil test, including a downloadable form to mail it in. I have mailed my soil test soil in double baggies and you get an email reply with your soil test report. 

Here is a link about planting trees: https://extension.umn.edu/how/planting-and-transplanting-trees-and-shrubs

Before you spend the resources on a non-native exotic tree and have it fail again, you might consider recommended trees for Minnesota: https://extension.umn.edu/trees-and-shrubs/trees-and-shrubs-minnesota-landscapes

Here is another link to trees recommended to help pollinators: https://extension.umn.edu/lawns-and-landscapes/trees-and-shrubs-pollinators This includes many flowering trees. 

Our pollinators need trees they are familiar with. Our pollinators are dying at an amazing rate. 

Good Luck!