Before doing "luck of the draw" gear swaps, why don't you measure your system's frequency response? Bass "slam and extension" and "lean-ness" should be easily able to be measured.
Measure your system both with and without the preamp, and compare the differences that you see in the chart.
That will give a much more clear picture, and pave the way for fixing what you don't like about it
Measure your system both with and without the preamp, and compare the differences that you see in the chart.
That will give a much more clear picture, and pave the way for fixing what you don't like about it