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Hey, I am having trouble finding slime's in my newly generated world. I have used a 3rd party program to find where exactly the slime chunks should be and began digging a 16x16 (one chunk) 3 high room, one level above bedrock. After clearing almost all of the caves in a 100m radius and waiting for around 10-20 minutes nothing had spawned and decided to try digging another room (to maximize the spawning rates) but to no avail not a single slime. Anyone have any idea's on what I should try?

Thanks for your time it is greatly appreciated.

You need to be a little distance away from the room to allow them to spawn. Go to the slime wiki page and read again the spawning rules.

Use TNT and blow as much as you can down there, put some torches around too

Your on the right track, 3 high ceilings, but keep in mind that waiting is only half of the equation in spawning. The other half is that you must be at least 24 blocks away from the closest spawn block in your chunk. Additional floor help considerably Just blowing a huge hole in the area with TNT and adding floors after is probably the way to go if you have the tnt.

Also remember that any 'torch' placed on the ground omits a spawn space, it is better to use jack o' lanterns in the floor/ceiling for light as they are spawnable by slimes.

I have never used a slime chunk locator and make out just fine. Generally what I do is start off with a branch mine at Y=12 to look for diamonds. If a baby slime appears in one of the tunnels I open that area up to 50x50. It will take longer than going straight for a slime chunk, so if you need slime "right now" go with the other suggestions.

Ok so you might be experiencing something that hit me after TU12. The slime finder I used was giving me false positives for my seed. I duplicated my seed as a super flat in creative and searched a total of 3 areas that the slime finder identified as slime chunks but the first 2 had absolutely no slimes. I finally saw slimes spawn in the 3rd area I searched so be very careful when using the slime finder.

Quote from HernDiddy

Ok so you might be experiencing something that hit me after TU12. The slime finder I used was giving me false positives for my seed. I duplicated my seed as a super flat in creative and searched a total of 3 areas that the slime finder identified as slime chunks but the first 2 had absolutely no slimes. I finally saw slimes spawn in the 3rd area I searched so be very careful when using the slime finder.

I tired your suggestion beforehand, and I checked the patch notes and they reduced the spawn rates in super flat worlds, thought that could be why I wasn't seeing them spawn in that chunk as well as a few others on the slime finder. I waited for a while and found a few spawn chunks in the super flat world near my town and now using those... Thank you all for your suggestions I appreciate it!

Wait your using a superflat? I don't think slime chunk finders work with superflats. Havn't really tested it either, but I know normal worlds slime chunk finder works as i've used it countless times. There is another way to find slimes, and that is to do the calculation yourself. Its a pretty straight forward calculation but you MUST be able to figure out what 'chunk' your in which is a bit difficult to do on the 360. I did have the formula for doing this based on your x,z,y cords but seem to have miss placed it, however if you search the forums you should find out how to calculate what chunk your in.

Heres the formula for finding out if a particular x,z position of a chunk can support slimes, taken directly from the wiki, keep in mind that y must be less then 40, except in once slimes can spawn in swamps they can spawn between 50 and 70 at night providing the light level is 8 or less.

   Random rnd = new Random(seed + (long) (xPosition * xPosition * 0x4c1906) +
					 (long) (xPosition * 0x5ac0db) +
					 (long) (zPosition * zPosition) * 0x4307a7L +
					 (long) (zPosition * 0x5f24f) ^ 0x3ad8025f);
   return rnd.nextInt(10) == 0;

That is, using the chunk coordinates to help generate a seed, a random number between 0 and 9 will be generated, and if that number is 0, the chunk will be able to spawn slimes. To convert world coordinates to chunk coordinates, divide by 16 and round down.

From the wiki page located here http://minecraft.gamepedia.com/Slime#Spawning

Hope it helps.

Yeah, I wasted several hours after I dug out 2 areas in my survival world based on slime finder results. I finally found an area after testing it in a super flat and it did spawn slimes in my regular world. I swear, my world is totally corrupt. Remember I have a 35 villager cap...!!