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What speakers are your using? The “4R at about 80 Hz before going back up their average 8 Ohms at 30 Hz” is not good for SETs.  I prefer to have 16R and do not let it to drop below 12R.  Lamm is quite fixable with loading, probably because of the feedback. I do not know how Lamm loaded the output stage. It was possible to figure out but I did not care. Generally a full 6C33C might be loaded form 500R up to 1.8K, or in some cases even higher. It all depends of many factors within amplifier and with within speakers. Usually the 800R-1200R works out well. Sure the “speed” and transient capacity of speakers is a huge factor, as different speakers would handle harmonics differently… Do not forget that the tube drops plate impedance with raise current. Lamm is less sensitive for current change but still it is with auditable for bass the change between the 280mA and 310mA. Less current higher impedance but very interesting, although very minor improvement in bass.  Sure, you loose power, so add some voltage. Balancing the amp with sufficient voltage and sufficient current for the given signal, given loading and the given load it is possible to dial in very precise bass. I usually drove my LF pair of ML2 at ~185-190V and 280-280mA.

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