Hi Crazee Raff,
as Rounik said and as you found out, delay layers just a small amount can make a massive difference.
Another good thickener is a stereo tune up tune down effect.
You have your bell synth on one track. Leave it panned at 12 o'clock. Then, copy the track two more times. Pan one full right and the other full left. Pitch shift one of them 3 cents up and the other 3 cents down... kind of adds a stereo shimmer. You can experiment with different tuning amounts to get different effects too :)
Another wicked little trick I've seen used here and there is to put the sound in a sampler. Transpose the tuning of the sound using the number entry box just to the top left of the tuning dial, and then adjust the tuning dial by an equal but opposite amount. For example, transpose box = -12 and the tune dial = +12. The sound has changed. Blend that with the original track and hey presto... thicker :)