What tubes are you running in the Blueberry?
You will be able to reduce tube rush somewhat by changing out tubes.
As an aside, you may need to decide between a little noise/fun and alive vs. total quiet/dead-sounding.
The Blueberry is an extraordinary component for the money.
I own and have owned a number of diff. pre's and the Blueberry and Peach are ridiculously good for the money.