There's a lot here but hopefully others will kick in.
Your Stabilizer level cannot be right--it might be 20.15, but not 2015.
Brushing your pool was ABSOLUTELY the right thing to do, but if it costs you $300 in chemicals you were possibly "POOLSTORED!"
You didn't say how big the pool is.
I'm not sure I know what "buffer" is.
Seriously, I suggest you go tonight to our various topics and read the stickied sections, especially those authored by Pooldoc, Watermom, aylad, Poconos, or myself, CarlD. We cover algae, chemicals, testing, spring opening and just about everything you raised questions about.
As for the vacuum: Do you make sure it's full of water first? Do you plug it into the skimmer or a low drain, and shut off the other when you do? Do you set the filter to "Waste" so the stuff goes down the drain and not into your sand? Air bubbles are the bane of vacuums. The EASIEST way to fill the hose is to hold it to the return with the pump running. That pushes water in and air out.--keep both ends under water!
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