sixcard mark
i forget how the name it but since the reel stops are literally virtual
this is hypethetical but gives an ides how it works
jackpot 1 stop
2nd highest 2 stops
3rd highest 5 stops
...
next to lowest 100 stops
no win 500 stops
so a lower percentage would change it similar to
jackpot 1 stop
2nd highest 2 stops
3rd highest 4 stops
...
next to lowest 95 stops
no win 600 stops
of course these are not acutall numbers but gives the idea
** side note, on poker machines they just change the payout amount per win, which is why poker slot players now which machines have higher percentage just by locking at the pay table