Apple counts a charge cycle as a full charge of the battery. You don't get a cycle added if you charge the battery from 50% to full. But if you charge from 50% to full twice, then you will get a cycle. 2x50%=100% :)
If you have already reached 432 cycles. That's a lot. That means you fully drain your battery every day if you have your Mac just over a year. If you do indeed drain your battery completely everyday then 432 cycles sounds normal.
Batteries loose their capacity over time. So if your battery app reports that only 85% of the original capacity is remaining. That's quite possible.
Apple rates their batteries for about 1000 charging cycles. So it seems you're almost halfway through.
I know from experience that streaming stuff puts a big drain on your battery. If you stream a lot, try to use a normal power outlet as much as possible :)