Ron,
Great to hear from you!
For “virtual” columns inside of DAX formula: Instead of MAX(), consider MAXX(). Instead of VALUES(), consider a SUMMARIZE() that selects one column from another SUMMARIZE().
If there are multiple references to the same virtual table in a single formula, variables will help with both readability and performance.
You can read an interesting post about SUMMARIZE and SUMMARIZECOLUMNS here. Apparently SUMMARIZECOLUMNS was created to be a better function than SUMMARIZE, but SUMMARIZECOLUMNS has produced its own share of surprises.
Tom