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It’s in my manual.
On Page 22 the function of Jumpers S14 and S15 are described.
On Page 26, under RF POWER OUTPUT, there’s a critical sentence explaining the purpose of C7 and C8, which are selected by those jumpers.
What I am able to glean from the manual is that C7 and C8 may not be needed, but in some cases can optimize the E-Class Operation.
In my transmitter I found, by observing the output on a spectrum analyzer, that S14, C8, gave a higher peak.
The same thing could be done with a meter.