I always play three slots from elk studio.
Ecuador Gold,Catmando Gold and Tahiti Gold.
Ecuador usually pays really well at 0.2€ bet. As soon as you raise to something else it takes forever to get bonus and usually it pays less with higher bets, oddly enough. And atleast in my experience, only the last two or three drops actually pays and it never reetriggers. But as soon as you get a good scatter win it will spinn you down to zero. I have noticed something strange, if I lose big in one ELK slot I can change to another of the three above and get back almost all losses….