Okay, I think the affair is over with the Soekris direct into the amp .
This is how it starts, you’ll be back, maybe not tomorrow looking for things you mentioned by going direct that are now missing with the pre in.
More detailI’d add to those maybe also bass definition and depth.
More contrast between highest and lowest notes
More ambient information - deeper soundstage, maybe?
Same happened to me. It just a matter of fine tuning when going direct, like you spent with the tube pre in, not just over night tune, probably months?
Cheers George