AD9625-2.5EBZ Poor Performance

I am using the AD9625-2.5EBZ with the HSC-ADC-EVALZ and VisualAnalog to record ADC data. Seeing very poor SNR (30-35 dB) with an average noise power per bin around -75 dBFS.

Using Agilent E8257D Signal Generators for both the clock and input signal source along with variable bandpass filters from K&L. Sampling at 2.5 GSPS.

I suspect using the E8257D as the clock source is causing the high noise floor. Can anyone recommend devices to use instead?  Could anything else be causing the high noise floor and subsequent poor performance?