Most places advertise as spores, when it's actually liquid culture.
It's not legal to sell the culture of any magic mushroom, so they call it spores for souvenir / research and development purposes to get by with microspcopy laws, like with cannabis seeds long before it was legal. but you don't get spores in the syringes. unless you really reeeeeeaaally lucky.
spores generally cost significantly more. just look at the spore sprints. that's why the syringes are so cheap in comparison to them, because they actually contain liquid culture. quite the big difference in the two.
I do all my grain work in jars, actually much easier than the bags. I get the bags for my gourmet mushrooms, but often have one tear open or just kinda split open on a seem. remember they have to go through the pressure cooker and with it already being thick polypropelene it kinda tends to form it's own seems and tear or open along those lines.
they work nice for a while, but you also can't reuse them. I just moved back to jars, waaaayyy easier. get a tennis ball, when you fill the jars with the grain, don't fill it to the top. leave some room so the grains can move around when you shake it, hit it against the tennis ball just so it comes off the sides of the jar and it should break apart very very easily.
I trust the jars way more than those bags. they also become expensive over time.
I would say this flips the seesaws into the opposite side of the spectrum with too little air flow.
remember this is a golden key, although mushrooms grow in high humidity, fresh air and fresh oxygen is even more important than the high humidity.
when there's too much co2 the mushrooms can't breathe. it's the same as sticking your head in a closed box with high humidity, cause mushrooms breathe the same as humans. they want constant supply of fresh oxygen. just with added humidity.
I would say stick to what you where going to do here,
I think closing some holes will work perfect! maybe close the whole middle row?
Goodluck brother!