@wndsnb: Haha, we think alike. That's the same fan as I listed from Mouser. I can't find (yet) a dedicated, high power fan controller/hub for these fans. Closest thing I could find is the ZXS breakout board, which has lots of fan inputs but I can't find any output specs on it for the fans https://www.parallelminer.com/product/zsx-breakout-board-16-ports-pico-24pin-atx-fan-hubs-100-gpu-mining-a-game-changer/
also, this: https://www.onestopgrowshop.co.uk/products/control-freak-7-amp-dynamic-frequency-fan-speed-controller A bit expensive though and not very clear specs also
And yes, you are right: static pressure needs to be increased. The Delta QFR1212GHE has 29 mmAq; the Sanyo Denki 9LG1212P1G001 has 37mmAg, so a 30% increase but to no avail if the miner has issues recognizing the new fan. If I do find a controller, I'm definitely going for the big guns 300+CFM fans and I'm pretty sure I wouldn't even need to run them at full blast. Thank you for your input on this.

@NotFuzzyWarm: Thank you. I think I'm sweating the details too much. I'll just order the TVN6100s and experiment with higher CFM fans at a later time, when cooling isn't priority no.1

Thank you all again for taking the time to help me with this