@gdnrbob My experience is similar; while for lower draw amps there might be little downside to using a power conditioner, a high draw amp will be choked by a power conditioner no matter the quality and irrespective of reviews claiming otherwise.
Seperately, low gauge high quality PCs make a huge difference for high draw power amps. But again, directly to the wall.
Seperately, low gauge high quality PCs make a huge difference for high draw power amps. But again, directly to the wall.