You should get more with a wired ethernet connection. Do you have the T3200M modem? I use that for Internet 75 service. The modem Status screen shows me the following for Attainable Line Rate and SNR:
Line 1 SNR/rate 13 dB/59371 down, 8dB/12937 up
Line 2 SNR/rate 11.9 dB/57862 down, 7.1 dB/12186 up
Attainable rate depends on the line quality. My line 1 is better than line 2, but the total should be in the range of 115 down and 25 up. I don't pay for that and actually get 75 down, and 21 up.