I don't think it needs the biggest buff, it's more the doctrine its in that also lets it down. I mean IR Pathfinder are really the only strong thing about it. USF doesn't need more recon runs, Forward Observer isn't that much of a boost and has a ton of requirements before it activates, and the off-map combat group is RNG based while also costing a ton of manpower.
My suggestions as usual, pasted from the mod.
M8 Greyhound
Improved 37mm performance/standardized to better reflect its cost and timing. Added smoke to improve survivability and Canister cost reduced due to it no longer instant killing models and requires the vehicle to get close.
-Reload standardized from 2.8/4.4 to 3.
-Canister shot from 50 to 40 munitions.
-Now has Smokescreen ability. Same as the M20.