I love slots but i find it like you that its not based on luck. If I have one decent session and play the day after, ALL slots will Rip 90x out of 100 spins everytime.
So as u i have a hard time finding it based on luck. If they base their slots on the rtp it should be possible to have 2 good sessions in a row which ive never had through 1000s of deposits over the years