It's not only the modem but the network it's on.. Are you using the TW/ Spectrum speedtest tool?
Did your speeds slow down when the speed was raised? What was it measured at before?
Copy and paste the new signal level page...
This in the home channel was the primary issue:
|Channel||Lock Status||Modulation||Channel ID||Frequency||Power||SNR||Corrected||Uncorrectables|
|1||Locked||QAM256||17||555000000 Hz||1.4 dBmV||39.1 dB||22400||7787|