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Help with Differential Probe Limits - Max Differential vs Max to Ground

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NY2KW:
I would appreciate help understanding correct use of a high voltage differential probe specification (MicSig MDP702) maximum input differential Voltage versus maximum voltage to ground.  I want to use the probe as a single end active probe to trace small signals (~ 3MHz) in a RF tube amplifier with plate voltages ~ 200-300VDC.  I believe my problem is in one of the LC tuned circuits between stages and there is full plate voltage at certain points I need to test.   

My basic question: am I correct that I can the probe at the 20x setting for single input referenced to chassis ground based on the CAT II limits or must I use it at the 200x setting (which has a much higher noise floor)?  My signal levels at some point are in the 100mV range. 

Maximum differential input ratings:
@ 20x : 70V (DC+AC PK)
@ 200x : 700V (DC+AC PK)
Max. Voltage to ground rating:
   CAT II 450V

Thanks in advance

Jerry

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