High powered single end 300b recommendations

Allnic A6000 monoblocks are rated 60w using EML XLS tubes, 4 per side. They also have a toggle for negative feedback and no negative feedback, which helps with more difficult speakers. They sound fantastic if you can find a pair. 

I have Altec 604E speakers in a mid-sized room. The real sensitivity of these speakers is ~97db. I drive it with a 6 watt 300B DIY SET amplifier with EML mesh plate tubes. I did experiments with changing 300B B+ power capacity. I started with 100uF per channel.
Then I went to 350uF electrolytic capacitors per channel. Next time I added 130uF of polypropylene and oil capacitors.
Each time I got very significant improvement in bass control, dynamics, separation, soundstage. The difference was much more significant compared to changing James Audio output transformers to Hashimoto H30 which cost 3-4 times more!
In the end I added another 1600uf of electrolytic CDE capacitors per channel and got another level of clarity, focus and bass control. The same happens when I added capacitors to the driver and input stage B+.
The difference between the initial variant of my amplifier to my amplifier now is huge. It is like its cost has increased 10 times.
I can’t imagine my speakers are capable of such bass performance with any amplifier.
I don’t understand why producers save on power supply capacitors. Why instead of going to the 845, 211 tube models don’t build a good power supply for 300B or 2a3 amplifiers that had much wider bandwidth, less distortions and a lot of other advantages.

Wyetech Labs is worth looking into. They have (2) 300 B mono block amps that are superb and produce about 23 watts per channel  running 2 300B tubes per channel.

Aric Audio will build you a very nice PP 300b.   

I'm using an Aric 300B set amp. My speakers are the Harbeth S-HL5+. I'm also using a pair of Rel T/9x subwoofers. My room is 12 x 19 and moderately treated. A Bricasti M3 feeds directly into the amp. My listening distance from the center of the speakers is 8'. I usually listen to Jazz and some basic rock from the 60's- 90's. The volume setting on the Bricastic is usually -20 to -25. This typically yields a volume of 70-80 decibels from my listening position. I have pushed the amp into the 90 decibel range on a rare occasion and not experienced any clipping. I live in Maine if you want to audition my system.