The variance in recommendations on the best carb to protein ratio to take postworkout seems to be much bigger than the variance in the milkshakes you reviewed (

The variance in recommendations on the best carb to protein ratio to take postworkout seems to be much bigger than the variance in the milkshakes you reviewed (between 1:1 and 5:1, with your shakes only varying between 2.7:1 and 4.4:1). Choosing one milkshake over another because the ratio is very slightly closer to a ratio you've arbitrarily picked as the ideal seems like over-optimisation. (Especially as some of the shakes are more than twice as big as others, which is going to make a lot more of a difference than minor ratio differences).