@sidog1460 What KT-88’s are you running now? I have a little Dennis Had Inspire KT-88 that is a clean, simple design with only one 6SN7 or SL7 signal/driver tube. The Inspire can run 6550, EL34, KT-66, -77, -88 and is very sensitive to tube rolling, I can distinguish subtle and not so subtle differences between tube models and brands.
It came with New Sensor Gold Lion KT-88’s, a clean, transparent, well balanced tube. I purchased a set of Shuguang Nature KT-88-T and found them “darker” with more bass response, a bit more bite in the midrange and good extended treble. They were only $65 ea. You may want to take a look at the Shuguang if you want to experiment a little without the investment SE’s would require for eight tubes.