Calanctus is right on the money regarding his two suggestions for a performance-oriented racking system and line conditioners.
But as critical as his suggestions are, it should not necessarily negate the need to replace that very subdued preamp.
With such a preamp as this, you may not even notice the tremendous benefits that a good racking system and line conditioners will provide.
A certain caliber of equipment is required to maximize the the tremendous benefits of a racking system and line conditioners and vice versa.
-IMO