Would you be opposed to putting a new hole right in the center of the room between the lights? Could do a setup like mine, exhaust and fan between the lights then put a hole about 8” in front of the exhaust, hook up your ducting and just jam it into the attic to blow away! Only about 12” of ducting is needed, then turn the Y you have there on the flat
I had the same issue had the exhaust on the side against the wall and light was hitting it
The FC-E8000 is a true 47”x47” but the FD6500 is like 44x38 so it gave me just enough To to squeeze the filter and fan between them in line then I just ran the 6” duct above the light to the corner and up and out of the tent. they can get a little squishy without any issues I agree
Or mount the exhaust between the lights and just duct up into the attic and have the filter up there
Video is empty tent after I got the setup completed
Updated plan