One Mini-Split, Two Rooms?

Im currently running a sealed system at around 1200PPM of CO2 and all HLG quantum boards. It was all previously one room where i installed a mini split but I have since separated the room by adding a wall so I can have a veg and flower room. However, the mini-split is in the flower room now and the veg room gets hot really easy. I currently have a 6 inch cloud line fan sucking some ac through some ducting that i taped right onto the mini-split but its not doing a good enough job. I also have a 6inch cloud line fan to exhaust the heat from the veg room into the flower room so air circulation is going through both rooms but not enough AC in the Veg room.

Any ideas on how to get some ac circulating into the veg room?

EDIT: Oh yea, the veg room is 350 Cubic Feet. Flower room is 550 Cubic feet.

I'm doing something similar.
In that situation, I vent my veg to outside/lung room, rather than recirc hot air back into flower. Yes, a lil Co2 loss/less efficient.

6" AC Infinity w controller to maintain temp, pulling from flower as needed.

If you get enough CFM exchanging between the two rooms you should be able to keep the veg room within a degree or two F of the flowering room. So bigger fans is probably what you need, a couple 8 inch centrifugal blowers should move enough air, and if you put carbon filters on them they will double as scrubbers. Make sure to grab cool air down low in the flower room and hot air up high in the veg room.

I would set a carbon filter on the floor in the flower room, put a 8 inch centrifugal fan on it and run 8 inch galvanized snap seam duct straight up the wall to right near the ceiling then elbow it through the wall to blow cool air in to the veg room up high.

Then in the veg room, mount a carbon filter up high on the ceiling and put a fan on that, run that straight over through the wall into the flowering room, blowing the hot air in to the flowering room up high.

Nice neat straight runs of galvanized snap seam, use some duct seal putty to seal around the holes in the wall. Just make sure that when you make your 8 inch holes you don't hit a stud lol. Sucks to start cutting a big circle in the drywall only to find that one side hits a stud. lol (Done it with 12 inch)

If the AC is able to keep up with the BTU's put off by both rooms then you will be good to go.

You can delete the carbon filters from that proposed setup, they are just if you want added odor control. With good carbon filters and that kind of air flow it would keep odor down big time.

Thanks for the replies. I already have 2 carbon filters in the room so it seems like just adding a bigger fan is my best bet. I seem to always find the most expensive hobbies lol.