I generally hated plugging my amps into any PS Audio PowerPlant that owned. I’ve not tried the ultimate outlets. Usually plugging amps in would shrink the soundstage and brighten the sound. I prefer plugging the amp directly into the wall and see if you have better results.
That said, If the items were purchased new, give it a week or two of runtime before evaluating. All power products require significant time for break in. I have had good experiences with their products as well, but just not with amps plugged in.
I’ve since moved on to Synergistic Research which feels much more natural and able to handle my current needs as well.