Sensible
Fair enough about flying out of limits, but that wasn't the case, the aircraft was just in w&b. I know that, because I was doing a BFR and had calculated the numbers and shown them to the instructor before departure.
So, say the aft limit was 93" and the aircraft was at 92 and a bit and 10lbs under gross, how would you feel then?
IF you inadvertently got into a spin (IF) from a full power stall (and the pitch up angle to stall an Archer at full power is pretty steep), how comfortable would you feel about recovering in an aircraft that was not certified for spinning?
So it's a matter of risk judgement isn't it? The Archer certainly isn't a hot ship, so you might well get away with no spin or recover from the spin.
But with a very rear c of g, previous experience in PA28-140s, which were cleared to spin within a very narrow forward c of g envelope, would not persuade me to take the risk of encountering a flat spin.