I have a very similar setup bro. Same tents and all. Different reflectors though. Not a nice mega reflect like that. What reflector is that?
I dont know if I could say this is the best way to do it, but a knowledgeable friend of mine who has been growing a couple decades longer than I've been alive recommended this setup to me and I have something that resulted from the advice.
Take the 700+cfm fan and and hang it/place it close to a fresh and cooler air source like a window, or just a part of the room with relatively cool/fresh air. Run ducting as smooth and straight as possible from the fan into the tent and fasten ducting to the light. Put more ducting on the other side of the light and run it thru the exhaust hole.
He said this was a closed loop light cooling method that will keep room temps down and reflector hoods cool to the touch. The other plus is the bugs like houseflys wont have an easy time getting into the light or into the tent thru the light with the constant and strong air movement. Like a river of air. You can do the same thing with the 6" setup in the veg room and weaker inline fan. 720 cfm is quite a lot of air movement for 1 light, so I personally have it split with a y fitting to cool both a 400w mh in an 8" reflector as well as the 1000w hps. With your 6" veg setup you maybe best just doing the same thing but with the 6" equipment for that tent.
For air intake you can do what your doing just blowing air in with those booster fans at least for the veg room. For the flower room I would take a carbon filter and 6" centrifugal or inline fan with some ducting and use it for exhaust and smell control. My same friend said this carbon filter/inline fan exhaust system will draw a good amount of fresh air passively. Once you have this setup the most important thing is moving the air in the tents around. With the carbon filter exhaust, closed loop light cooling, and your current intake and controls like that fan and ac, your air movement as well as temps in tent and reflectors should be solid. Cant go wrong with the
secret jardin, unless your gonna spend on gorilla it is the best mass produced tent from my research before buying and now using them.