Your exchange is superior to mine because you are much closer to your total cf per room.
I am exchanging about half of the cf of one room.
What I am thinkin about is 1000cfm intake and 1000cfm exhaust only equals 1000 cfm...
Whereas 1000cfm+1000cfm intake with a big passive exhaust might get closer to 2000cfm of exchange per a room.
Perhaps I have it all backwards tho, I am slipdexic.
Lol... I'm gonna beat this into your head, but in a friendly way... . You're still pushing 2000cfm. You're bringing in cool air from the room with the lights off, while at the same time sucking hot air out and dumping it in the other room to be reconditioned before being pumped back into the room with lights on. That sounds like a lung room to me. The only problem would be if you had mold or some sort of pest... But filters on the fan, higher heat and the high CO2 levels should help with those...
Think about it like this... A passive intake or exhaust is a bottleneck, and you can only remove as much air as is coming in for total exchange... Otherwise you get negative/positive pressure. If you have positive pressure, you're going to push the stink out any cracks, not just the passive intake/exhaust. I'm not telling you that you shouldn't increase your air exchange between rooms, but keep it how you have it already, with one fan pushing and one pulling. My air exchange is superior, but i'm not using CO2. I dump my air into the garage and pull fresh air through the crawl space, and pump it through a HEPA furnace filter to catch mold spores.