If there is room, add another washer. Won't hurt anything, just so long as it doesn't make things tight.
As far as adjusting the screws, just try to keep them even. Yes, it will tend to pull to one side if they aren't, but they are coarse thread.... I PROMISE you, you won't get it perfect. It will pull to one side of the other all the time. Every time you lift it, the shaft telescopes, so it will push and pull the sprocket side to side. There are no seals in those little needle bearings. Honestly, that whole drive bracket was poorly engineered in my opinion. Best advise you can get: Grease the crap out of it all the time. I grease mine every few hours of use. If I run it all day clearing drives for people, I carry a grease gun in the wagon. About every 3 hours or so, I grease it. Also oil the chain about 2 times a day. Lube won't hurt a thing, just makes it dirty. But you can wash it all off before you put it away for the season.
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