That should be a link for the acme greenhouse design handbook. All the equations you need are in there. If you’re not using smell mitigation, you can also run positive pressure from both ends with a “gable” vent to double your usable length…in practice it’s just longer pipe at the section you want raised to release air and cover the opening with insect cloth…thrip sized screen exists too, that was talked about earlier, conley greenhouse in CA is where I buy it.
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You need to incorporate a roof vent that spans the entire length of your arch. 30% shade is not going to effect your yields 30%, I say this with experience. Remember you will only need shade for a few weeks, you could also consider a retractable shade system that is only utilized during the heat of the day. Same concept with the swamp cooler. Only use when needed, a few hours during the heat. Lastly you could just consider HVAC, it’s very common with cannabis flower production.