Can FDMEE have 150 definition rows in an Import Format?

Using FDMEE v 11.1.2.4.200.012, on-prem and building a new location that will be taking in a large Excel file(few rows, many columns) as input.

I seem to have hit a limit in the amount of rows of definition that can be stored in an FDMEE import format. FDMEE starts logging a "String or binary data would be truncated" error during the Import step, when there are too many rows of definition in the import format. Delete enough definition rows, run with the exact same import file and the Import completes successfully. The maximum number of import format definition rows appears to be 89.