This may or may not help. I have used a McIntosh 2105 solid state amplifier for years, and I had the same issue. The amp has gain controls, and in an effort to use the preamp (several different ones) at a higher gain setting, I turned down the dual gain settings on the amp. Regardless of the preamp or speakers used, the sound was worse- lack of power and drive, diminished bass etc. It won't hurt you to try for yourself though.
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It's hard to say without having detailed design information on the unit. However, in pro audio circles the phrase "limiter" denotes something completely different than a gain control or attenuator or potentiometer, and I would guess that is applicable here since there are level controls on the unit in addition to the limiter function.
What a "limiter" does is to smoothly reduce gain as the signal amplitude approaches some maximum permissible value. While a level control/gain control/attenuator/potentiometer applies the selected amount of attenuation to the signal regardless of the signal's amplitude.
So I would suggest leaving the limiter function at 100% and using the unit's level controls to reduce its gain. That may or may not have some side-effects, which you'll have to judge by listening, but I would imagine that they would be subtle at most, while the limiter function (if that is what it indeed as) would have side-effects that would not be subtle at all.
Fwiw, I found these specs on the unit: