Bottlehead Seduction and tube rolling help

Hi all,

I just purchased a bottlehead seduction phono preamp. I think that the amp is fine but that I need to do some tube rolling before things start to work for me in my system. Currently, I find the tubes to be not very detailed or transparent. The current tubes are some kind of made in holland generic tube. I've also tried some russian 6922s. What tube would bring more detail and transparency.

thanks
andy