you should read IRS pub 463 pages 10 through 12 about 50% meals and those that can be excluded. most meals are subject to the 50% limit. that's why your audit risk jumped when you put in an amount for 100% you don't get to pick which % applies. there are rules for determining which % applies.
https://www.irs.gov/pub/irs-pdf/p463.pdf (2021 version)
