I generally start JR and SR with zero, but some kids drop down as you describe
Most common for kids with one or more of - weak HS GPA, bad WE, low playing time - I think - anecdotally, not having studied data
I would have gone with much more than 4 minutes if the kid was at 2.2 and his momentum was downward. I have had close calls with kids jumped to like 8. WIth a 2.2 , I think you need to go more like 12.
BUT, i lean toward a bit too much investment in academics