Tube rolling my preamp with 6922EH

What preamp? Some are more sensitive to tube rolling than others.

Of course: The some of the best 6922s(CCa, E188CC, 7308, E88CC by Telefunken, Siemens, Amperex, Valvo) DO have gold pins, but they(the gold pins)won't make any sonic improvement on a tube by themselves. Step up to a matched NOS pair of one of those variants in your preamp and the difference will amaze you.

My preamp is the Bob Carver Sunfire vacuum tube control center which is running 3 stock sovtek 6922's. I know better tubes will make an improvement and am trying to find some good tube alternatives.

In what way would you like to improve the sound from your pre-amp? You need a fix on that otherwise you will just be fling as blind as the recommendations that you will receive.

'Improvement' is too vague, especially when what most folks are actually looking for is a tonal 'difference'. The few that don't are usually looking for the same tonal balance but want greater clarity.

Tell us what you are looking for and if it is obtainable I'm sure you will get some sound recommendations.

Like to achieve a warmer, darker and transparent sound with a focused bass and less highs.