I would like a bit more 'alive' soundGiven yr power amplification, this (i.e. laid back sound) could be due to:
* room: overdamped. (if applicable clear drapes, heavy furniture fm the path b/ween spkr & listening pos)
* pre-amp; check tubes or, try another pre
* (most likely): spkrs. Great sounding, as you note, they weren't designed for high "explosions". They offer a more laid back -- rather than in yr face -- sound. Spkrs like A-Physic, Triangle, Avalon & many others, offer a more "lively" sound.
Although I doubt there will be earthshaking differences, you can try different wires (try, do not buy -- yet). Go for single core rather than multistrand -- or spaced strands (like Nordost) on the spkrs. Normally you can use unshielded cable for the spkrs.
Cheers