Switching slots did contributed to amount of bonuses I got but the then bonuses were small, comparing to non existant bonuses on other slots.
Well, you had just a single experience if I should judge by your post and I don’t think that’s enough for you to confirm that switching between different slots did contribute to your overall experience; you haven’t played a single slots before so you don’t know if you’d have had the same experience or not.
Altough, the Op is referring to physical slot machines which I haven’t used before but from my experience with slots online I don’t think switching between slots would make too much difference because as others have said everything is random your first spin could give you the mega bonus you’re looking for while the subsequent one would be after more than a thousand spins. It’s not because of the machine you’re using it’s actually just luck.