@LD50 I wonder if an approach to the situation you are describing has another option. You mentioned lower levels of THC due to larger flower growth? The genes of how the cannabiniods are inherited; Bt x Bt = high THC, BtxBd = Moderate THC and CBD Bd x Bd = High CBD. Might be a Bo modifier not sure if they ever found out how that works. 1:2:1 setup in Mendel terms.
I wonder if bigger plants produce larger tri-chomes? If you want want to increase the tri-chome size can you just veg the same plant longer and get a bigger plant with larger tri-chomes? Just some random thoughts.