As the air temp rises, my cart stumbles more

[Pipsta]

Well, the temperature outside is getting close to 100 in Phx, AZ during the day. So the evenings are staying pretty warm too for a while. I noticed last night that for the first hour or so of my driving the cart it kept wanting to stumble off a standstill. As soon as the air cooled by 10 degrees it stopped happening. It also mostly happens when I have a full load of people and I'm accelerating off a standstill. I also noticed a bit of smoke like 'rich' exhaust at these accelerating moments.

From the symptoms it seems like it's an air/fuel mixture issue. With hotter air there's less oxygen in the same amount of air and when I'm working the motor harder under load it needs to suck more air to match the increased fuel.

My air filter is new, the air ducts are sealed fine. Is there an adjustment I can do to the carb to help get a smidge more air into the mixture as the temp gets hotter outside? ...and believe me...it's only going to get hotter outside for the next 5 months here in AZ.

Any other ideas of things to check out to eliminate from the equation?