The Kenda 8x3s, but you’ll probably see similar consumption/esc heat as your 9" tires from them. Haven’t seen many, if any, 8x2.00-4 tires.
The smaller hub diameter tires may be able to be trimmed to fit the wider hubs though. As long as you don’t cut into the mesh/bead, you can usually take a few mill off, and that might be all that you need.
@3DServisas is there any option to buy gear drives by themselves… such as the FatBoy SS HD V3 when they are available? I’ve got the Mini Eco V2 and would possibly like to pop a second set of drives on my other bare FB320 hanger… gotta think about it though.