I believe your enzyme addition may have influenced your results. Getting all the gravity points from a mash is not the goal: brewing a good pint of beer is the goal.
A yr and a half ago, over a series of half a dozen + brews days, using the same ~12# grist, milled at the same ~.040 gap, 1.75:1 water ratio, 5.5 gal strike, 3 gal batch sparge volumes, mineral additions, .162 pump flow setting, etc, I took samples at 20 minute intervals throughout the entire mash.
When graphed, the data from that series overlaid upon each other are nearly indistinguishable one from another. Very consistent results.
Over that series, I noticed most of the SG increase takes place within 20 min. @152*F. ...but I measured additional SG increase to about the 100 min mark. Past the 100 min mark the SG did rise but very very little.
20 min 1.045, 5.47 pH, 65% of OG
40 min 1.056, 5.47 pH, + 11 points, 81% of OG (+16%)
60 min 1.060, 5.50 pH, + 4 points, 86% of OG (+5%)
80 min 1.065, 5.44 pH, + 5 points, 94% of OG (+8%)
90 min 1.069, 5.46 pH, + 4 points, (+6%)
But, I believe I also noticed something else: the resulting beers were “thinner”. This is purely anecdotal because I did not compare them side by side but I got that perception.
According to Palmer in How to Brew Chap 14: “A compromise of all factors yields the standard mash conditions for most homebrewers: a mash ratio of about 1.5 quarts of water per pound grain, pH of 5.3, temperature of 150-155°F and a time of about one hour. These conditions yield a wort with a nice maltiness and good fermentability.”
I have since moved back to one hour because I want more viscosity. It’s all just a balance of compromises.
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