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You winced? :eek:

My lightning thought was "How TF did I miss that a power sander is to be used and did not recommend something else?" - even though, to be honest, I have no experience with power...

After 320 I'd go at least 600, maybe 800 too.

Some guys also use 1000. I have done it, but then decided it's too much hassle, plus I always finish on something finer than the 8K, so I decided I...

Yes, rounding the edges a bit (just a bit) protects them - less likely to chip

Glass plate is fine, I just bought a marble tile from Lowes because this was the easiest and fastest I could do.
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Don't give up.

Do smaller sessions and test between them. It has to get better!

Maybe change what you have been doing a bit - say more work on the 8K, less pressure, X vs straight strokes - or...