I'm a pretty careless grower when it comes to the small stuff, and I don't make any effort to tweak my drenches for any particular purpose. I know that Neiko has been trying to boost his terps, for instance, and he's getting good results. Growth, Trans, and Cat drenches will all have different effects on terp production and strength. I typically apply Cat drench later than most people, and sometimes a second Cat cycle if they run long. That will effect terps, tending toward a dank aroma rather than the sweeter taste that Growth will produce. So far, I've been primarily feeding Growth near harvest.
I've run 8 DevilsCarnival F2s now. 2 were autos - one purple, one green. 2 were green photos - both heavy lime/fuel. 2 were green with some pinkish pistils - one Carn leaner, one DDA, with a mild fruity taste . And 2 were purple - one sweet plum and one blueberry muffin. The first purple photo, DC2, pollenated itself and the F3 (F1-S1-S2) seed produced a purple photo. It's still drying but seems to have the plum taste.
So yes, about 25% of the F2s are purple.