Ron,
You may not want to undergo a CFI flight check before an FAA or designated examiner without spotless, perfect, A/C paperwork. If you do you, might regret it. Might, as in maybe. Do you feel lucky?
Well, do you? It's your life, and your FAA record.
The A/C could be red tagged, i.e grounded, and you may get awarded a violation. Maybe not! I have no crystal ball.
I believe a current and accurate equipment list is always required as part of the FAA aproved A/C flight manual or operations manual, and this should be reviewed at every annual inspection, and flight check when using this aircraft .
Check the A/C logs for additions or removals of equipment since the weighing. If there are any changes, have a certificated A&P determine the current weight and balance and make an entry in the "flight manual" ( i.e new equipment list and weight and balance info).
If all else fails, redo the weighing procedure. EXPENSIVE!
Above all, keep your record clean!!
Increasing gross weight may require an STC and/or FAA field approval. Good luck with that.
Happy flying, hope to see you at Columbia in June.
Paul