Thanks for your kindest attention to my problem.
Well, at first, I'm running a 'shoutcast streaming', not a FM tx.

(just to be aligned...)
I lowered either win mixer output or SS2 output.(OtsDJ mix out doesn't need to lower as it's flat...no dynamics or eqing processing)
I don't refer to monitor or mixer direct out....I get distortion on 'S' and 'CH' after that, where pipeline has processed by multiband before going to streaming encoder. If I set SS2 in 'standby' vocals are clean.
Of course BBK presets are natural born sound booster....they make sound 'fat'...and I like it but it's the first time I try to use such presets in an hybrid format where vocals have a specific role which overtake common stingers or sweepers.
They act as teasers or promos so communication contents are longer and such a feature could point out the need to 'balance' BBK preset till to a kind of compromise
to co-live music and voice.
As Jesseg well said probably it's an issue of 'format' where we introduce the 'talk' element and not just music.
Did you have some good experience with some BBK where 'talk' element results 'clean'?
If you have it please give me a link to download and to test it.
Thanks