I understand the struggle mate.
I can really only suggest how I’d set up with those tents/ area - but you main issue is heat load caused by budget lights.
245 tent:
Exh. 6" fan
Supply: 4" fan
Light: 600W HPS in a Cool Tube or vented reflector
334 Cabinet (early veg/ clone)
4" exh. fan.
Your exhausts really need to exit the room to reduce heat and moisture and your room should be very well ventilated or conditioned. Perfect world you would exh. to outside and supply from outside.
IF you also need carbon filter for odours, go up one size in fan.
Keep your duct runs short and tight (flexiduct), gentle radius curves and you will help your fans a lot.
It really sounds like your fans are undersized though. But out of all that, probably the most important is the vented HPS reflector - the heat they put out will cook everything - worse still with poor ventilation.
A definite rethink is in order.