Awesome stir plate. I have a couple I've made, but really like your cigar box version w the labels.
I always have just cranked mine up to a point where they seem stable and don't throw the magnet or make any noise. A good solid vortex is all you need, but last thing u want is to come back to the plate and find the magnet thrown.
Other comment I'll make is why did u choose the 1 liter size for your flask? I started w a 500ml flask myself. But after I had done more reading, think it was jamils yeast book, I learned that the size of the starter affects growth. Without a sufficient volume you're really not growing many new cells. You are "waking them up" and getting them ready to ferment, but the usually growth and activity are the goal. This is why 2 liters is the most popular size, it should double the cell count of a single vial. Some of the larger 3 - 5 liter sizes are also useful if you're using multiple vials for a big batch or lager or something. I'd recommend messing around w one of the yeast calculators to find the sweet spot for your brew size/type.
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