Vpd, vapor (water) pressure deficit (difference) between two atmospheres.
The more optimal vpd the more efficient the plant will drive transpiration, transpiration drives osmosis which creates turgor. High turgor, high cell elongation, high stress, high workload.
Vpd is about rapid growth. Last week or two of ripening is not about rapid growth, I always find terpene profile is at its highest probably 2 weeks prior to trichomes being ready, but that's just my opinion. Last week or two should be lowering rh to ensure a safe finish, high temps come with high humidity, still pushing 85f for last two weeks you will be lucky to have any profile whatsoever. As buds get bigger they become thick, moisture can easily get trapped in 50+rh bringing with it botyris( bud rot) Terpenes start to degrade around 68f and above. It's about finding a balance, any time I tried to push growth hard for last weeks all I end up doing was burning off smell and taste and promoting early CBN production in buds. Buds will be airy the more heat they are exposed to. cannabis buds can be affected by cold temperatures and can experience compression, not going to change drastically but the difference was noticeable.
Good luck 👍