Slimes spawn in funky ways,
I cant remember how they are worked out, but it is different to normal mobs. keep looking, or try reloading your world and going straight into a slime chunk, just remember mobs wont spawn within 24 blocks of you
They can only spawn below 40 in slime chunk. The light level doesnt matter for them to spawn but the space has to be big enough for one to spawn. Also make shure your not on peaceful mode or they wont spawn. Look at the Minecraft wiki on slimes for more
Rei's minimap shows me the same chunks as the ap i used so i went to the superflat world with the same seed and those chunks spawn slimes. So it must be something with my map or the level that i dug out. Thanks for the help maybe I'll figure it out.