Do I have enough airflow in my tank ?

I had trouble with keeping humidity in my cage. I have an exo-terra 36x18x18
I have solved that problem yesterday by covering the top with plexi glass and switching to one infra red lamp instead of two.
I have 2 water dishes, a fogger that I run when needed, and a heat pad on the right side of the tank controlled by herpstat 1 .
I drilled 5 big holes on the right side and 5 small holed on the cold side, on the top of plexi glass, also exo terra cage have little airflow holes up front.
Please see pictures attached.
Do you think my ball python has enough air in there ? Should I cut more holes. I have no trouble with humidity anymore, but I want to make sure, that she has enough air supply. Thanks
http://imgur.com/VAspi9N

http://imgur.com/VAspi9N
http://imgur.com/gwujI23
http://imgur.com/gwujI23

If humidity is good I don't think you need anymore holes

Air flow is overrated. Holding humidity is much more important. As long as you don't have stagnant, wet conditions constantly, and aren't growing mold you should be fine. Opening up the enclosure every day for maintenance, feeding, handling etc is plenty to refresh air. Many closed chamber designs for reptiles that require ultra high humidity have very minimal airflow.

However, to keep humidity around 50-60% for BPs you shouldn't need to cover more than about 3/4 of the vents to achieve humidity, depending on your geographic location.

Thank you so much for your reply, because I was a bit worried. I did have to cut another hole on the cold side today for another lamp with infrared bulb, because I couldn't get the temperature higher than 74 F on that side. It sucks out humidity much faster, but it is still holds ok. With one lamp on the hot side and just small holes, I was loosing maybe 1% of humidity per like 6-8 hours, with extra lamp and also I did cut some extra holes, it is about 1-2 % lost per 3 hours which is not to bad.

Yeah that sounds fine, as long as all your temps are stable, and you can keep humidity in acceptable parameters. It is ok for humidity to oscillate up and down, as long as the majority of the time it is within specs.