Nice! What stakes are those?

If you can keep 32.58 bb/100 over a large sampleyou are a crusher!

28k hands is not a big sample, but with such a big win rate over that sample it is extremely likely that your real win rate is positive. Furthermore, it is very likely that it is also quite good. 32 BB/100 is of course unsustainable unless you are superhuman. :-)

Depends

How many tables? :)

Svenskaspel is the most easy site to beat when it comes to small stakes, your winrate will be much smaller on euro sites and stars if even a winner. So it depends.