Perlite is very good at aerating soil, using 50% of each you should have watered backwards, ever increasing as the plant grows larger. I use no more than 20% with my soil mixes. It is what I learned, never had a problem.
Watering should only be done when the medium is completely dry, or darn close to it. Forgetting the outer rim of the plant near the edge of the container will cause poor root growth. Start at the edge and work in, completely soaking the medium.
You should be using close to full strength nutes at this time, adding in CO2 wouldn't hurt if you can get 85+ deg F temps.
Lots of air circulation.
Check your pH, it should be about 6.5. When it drops dramatically you need to flush, then feed at the next watering cycle. When it goes up, your plants are munching away!
Maintain your humidity 20 pts lower than the temp, roughly. (For example: 80 deg F; 60% RH. 85 deg F; 65% RH, 75 deg F; 55% RH.)
That's about all I can think of right now.
E