Cwazz,
Tube amps can sound mighty different. Particular things to keep in mind with them are not only the tubes used but also whether there is negative feeback in the circuitry and the amp's damping factor. Too high a damping factor with designs like the Lores leads to overdamped bass. That may or may not be your problem, but I'd put it on the list of suspects. I loved the Aleph 30 in a DIY speaker of similar design to the Lore. But the damping factor was too high and this seriously impacted the quality and amount of bass I got compared to amps with lower damping factors. Of course there is also the worry of underdamping too, which leads to less controlled, boomier bass.
Might be the speaker, might be synergy with this mystery unnamed tube amp.