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I would start with the two 2-Watt resistors just below the preamp relay, the black one that says "Sigma". These are the low side resistors. The one on the right is marked 27 ohms, red-violet-black. Changing it to 47 ohms at 2 Watts might get your carrier into the sweet spot around 30 or 35 Watts on "Low".
Odds are the linear will sound better with around 2 Watts carrier from the radio. You could skip changing the low-side resistors in the amplifier and install a carrier control on the radio. That would let you get the carrier level down to the comfort zone around 30 Watts on High side without altering the amplifier.
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