I like to think that when I improve on the design of an amplifier, the increased gain is totally the result of my efforts.  Well……that’s just my ego talking.  Sometimes, even a blind squirrel finds an acorn.  Such is the case with my Kenwood TL-922A.  This improved amplifier is now capable of maximum-legal-output plus on all bands.  In fact, I only hit it with 60 Watts drive on 10 meters.  It has a tested maximum output of 2250 Watts on 80 meters; with 100 Watts drive.
To be fair, I believe most of this unexpected gain is from improvements in the recent batch of Taylor tubes.  My latest pair of Taylor 3-500ZGs has a manufacturing date code of 12th week / 2020.  The new Taylors are physically much different from the Taylors that I purchased in 2017.  I noticed immediately that the glass envelopes were thicker, and they were sporting new white porcelain pin stiffeners.