Hopefully someone smarter than me can chime in to help you out - I had to sync a new node last week and was torn about what to run. Ultimately, realized that datacarriersize was not only still in the codebase, but the planned deprecation for that setting was removed before they ever shipped v30. I decided to run 30.2. Synced in less than 12hrs on very modest hardware

yes, CTRL+F for MAX_OP_RETURN_RELAY on this page to verify https://github.com/bitcoin/bitcoin/blob/v29.3/src/policy/policy.h

awww thanks publius! yes 83 bytes is what I am after