I think you've correctly isolated the problem to the fuel you use. Find a different gas station. My personal preference is one by an interstate that uses a lot of fuel. Small stations sometimes don't get new fuel as often. Then as stated, look for non-alcohol fuel. It eats/disolves some metals, like the aluminum in your carb.
A good first step would be to try to run your power tools dry each cycle. I admit I don't, but if you have trouble, its a good first step. Just go out and start each one and let it warm up. Shut if off and dump your fuel in the tank out. Use a funnel and catch it back in the gas can. Then restart your engine and let it run itself out. It takes a minute or two.
Yes, I have Stihl chain saws, leaf blower, weed eater. Nary a problem with them. But I buy my fuel out of state. My county requires rotten fuel, so I cross the river to Ohio where they have good gas, both for my vehicles and power tools.