Focal Aria 948

The Parasound A21+ is a hugely (!) more powerful amp than the Pioneer 1250. 

Amps like the Pioneer SX 1250, while measuring at 160 wpc had very low current… the real thing that supplies impact. High current designs did not start becoming common until the 1980’s and then only I expensive amp only components.

Did you spend a lot of time positioning them? Performance is very highly dependent on positioning. Typically I start with the official recommendation and work from there. Distance from back and sidewalls, and triangle size are important.

Also, are they broken in. It is best to get a hundred hours on them.

Your electronics are oriented towards musical, natural, and mid range bloom. That is the strength of them. Tube stuff will have detailed nuanced bass that is very natural. Slam is something you get primarily from solid state equipment with a lot of power.