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You are now reporting that you achieve unity volume level at about 3:00 o’clock on the Volume pot.  Setting both Gain controls at max should produce unity level near 2:00 o’clock.  So, you are not that far off from the expected results.  I suggest you try adjusting all three trimmers to increase the output of the transistors.  As long as you can achieve unity level, you are achieving the desired results.  The SUNN T is primarily designed as a tonal modification device.  It was not intended to be simply a volume boost.  I think you are close to achieving the desired tones.