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Troubles in Matlab Simulation of Multibit CTDSM

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Hi All,
I'm simulating 1-st order continious time delta-sigma modulator with 2-bit quantizer, but i found out its SNR is only 1 dB better than the 1-bit quantizer:
1-bit SNR=70.3dB @ OSR=256;
2-bit SNR=71.3dB @ OSR=256;
3-bit SNR=80.1dB @ OSR=256.
What's wrong with it?
I use 'calcSNR' function from SDtoolbox to calculate SNR.
Could you please help me figure out where is my mistake and why I get this poor SNR?

The attached are the simulink model and script for Matlab to run simulation.
Thanks a lot.
 

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