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RE: Dynaco mod

It could make sense.

Mid-range tube amp usually have decent output transformers with relatively low resonant frequency and high leakage inductance (leading to considerable phase shift as signal frequency increases).
Thus, if you measure THD/IMD across entire audio spectrum, you may notice that with 20 dB GNFB & high output power THD rise from 0.5%/1 KHz to as much as 5%/20 KHz (IMD raises proportionally).
In order to reduce side effect, decreasing GNFB may help.
Capacitor you mention one should select manually with minimum overshoot at square wave around 2 KHz. Use variable capacitor from old radio in series with 0.01 - 0.05uF film cap and oscilloscope to do so.

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