a- vs a+ is on avg a 1.66 variance (.33 per third of a letter grade) in level of effort required, hv are not known for sure in terms of level of effort, but I call them 1/2 of a cv, so GT spent 24 cv + 12 net cv as result of 24 hv = 36 total equiv cv, A&M spent 22 cv time 1.66 equals right around 36.6 equiv CV, should have been very close, even without considering credit. If A&M A+ was stronger than tech's A-, the gap may have been even wider than 1.66.
I have not heard anyone try to quantify starts or minutes into equiv CV's, but I don't think it is worth very many, maybe less than 1. I would guess a start and 15 minutes might be worth 2, really a much more useful tool in d2 or d3 than in d1 where the money is so high on these top recruits.