We need to know what your finished dough temperature was, and yes 1% IDY was too much yeast. I would have suggested using 0.25 to not more than 0.3% IDY for a 72-hour fermentation period. You also want to use the SAF (RED LABEL) yeast, NOT the GOLD LABEL, as stated, the gold label is a high sugar tolerant form of IDY BUT it also has a very low tolerance to salt. Typically we see a slowing of fermentation rate when salt levels above 1% are used with this type of yeast.
My guess is that your finished dough temperature was too high which would explain the fermentation rate which you were experiencing, a good finished dough temperature to target is 70 to 75F/21.1 to 23.8C.
Tom Lehmann/The Dough Doctor