You *have* to take them out earlier...I use the same recipe. Leaving them in the full time, on uncoated, but foil lined, baking sheets, results in hard ones. Ours stay soft for a day.or more.
We use full butter, never any Crisco, but farm fresh eggs, real butter, almond instead of vanilla extract....
Also, the type of oven (gas/electric) may have a hand in it. My biscuits never turn out right in gas ovens....
"For the time will come when people will not tolerate sound doctrine, but, following their own desires will surround themselves with teachers who tickle their ears. They will stop listening to the truth and wander off to fables." (2 Timothy 4:3-4).