20 amp dedicated lines

Id like to get opinions of those who have installed 20 amp dedicated lines. Did you notice a huge improvement, little or no improvement with the addition of 20 amp lines? My system is very lean with ill defined bass. I have tried everything I can think of to cure this problem with the exception of installing 20 amp lines. System consists of:
Wadia 861
Supratek Chennin pre
Parasound JC 1s
Vandersteen 3A sigs
Vandersteen 2Wq subs (2)
Alphacore MI2 spk cable (35' run)
Audioquest Cheetah inter
Cardas Golden Cross inter
GIK wall treatment behind spks, 1st and 2nd reflection, corners.

Its funny Vandersteen speakers are not known for being bright but my system is extremely bright and lean in the bass. I love the detail and spaciousness the Cheetah brings to the table but the sound becomes very unmusical. I have tried all speaker locations Q settings, level adjustments, x over settings etc...... Im thinking maybee the JC 1s are not getting enough juice. Any help much appreciated

Thanks