I have done everything I can find to do for a slime farm. I have used the slime chunk finder app, found different chunks, carved them out, some from 5-40 with multiple pads, some just one pad. I have lit up surrounding caves, extremely thorough in some cases and not so thorough in others. I've measured distances to make sure I'm not too close and not too far away. I've worked in the area some, afk'd in the area. At most I'll find a slime or two, but that is extremely rare. I play on an smp bukkit server that I admin, so there are no strange mods messing with spawning. I got tired of it last night and just left minecraft running, slept for 7 or 8 hours and woke up.. zero slimes. I'm within 24 blocks of the water channel to move the slimes closer so they shouldn't have despawned. All my slime chunks I know ARE slime chunks because I do catch an occasional one, but very very very rarely.
What am I doing wrong? It is such a struggle to find slimes and I am a piston lovin' fool.
ANY help or advice you can provide would be appreciated.