It sounds as though your WE tubes are not well matched. If they were, the hum would not be an issue. Try to switch the tubes so that each has a different mate (i.e. switch the outside tubes or the inside tubes) and see if that helps.
I have a VAC 30/30 and really like it. The WE tubes are mellower, less aggressive and have better midrange. In my system and for my tastes, that is just what I want. You may like something else.
Also, try a variety of 6SN7's. They make an important difference and can help you "season to taste."
Finally, do not forget power cords, speaker cable and interconnects. In each case, I have chosen to maximize warmth and body (Mogami interconnects and speaker cables and a Shunyata Black Mamba PC).
If you have problems or need additional advice, VAC is absolutely super to deal with and will help you get it right. Call them.