Relatively Light, 2.5/5 : CT (either), T2300/2300AD
Moderately crunchy (3.5/5) : MT, MgT1, MgT2, T20, HT
Rather crunchy (4/5) : TNE, T4, GT, GTIW, T5
I'd put D&D 5 core triplet only at about 2.5, as well... and about 3.0 with splats.
If you stick solely to core, drop half a point (full point...