Great for THC production in flower TaNg, but i think the lower humidity could be behind the smaller node spacing, during veg. if you're up for a wee experiment try running the next lot in a room with a raised humidity from the start till the end of the stretch, then dropping it down. Would be really interesting how just doing this could alter the structure of the plant, but as i was saying earlier, enviroment can have quite a major impact on how the plants express themselves.
This makes sense because the last photo run I did was high 50s in stretch and boy did they stretch.....to be honest bro I prefer tighter nodes means i get a shorter plants,80-90cm is perfect for me I also worry about condensation on the optics with high RH.