hissing sibilants


I'm having trouble with this hisssssing "esses" and sssibilantsss.
I have a Pro-ject RPM9.1x TT + 9cc tonearm, Lyra Delos cart and Electrocompaniet ECP-1 phono stage.
I may blame it on:
- alignment, namely VTA (it's set just correct, i.e. arm is horizontal, but some say Delos "likes" to be a tad higher than the tail of the arm, is that true ?)
- load impedance: ECP-1 does not allow regulations, they say it does all by itself; yes, but how, and what's most, which load is it set at ? I don't know.

what's your opinion ?
thanks, ciao
daniele_g

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