Assistance with Coincident set-up

I have Coincident Total Victory IV speakers with Frankenstein II 300b amps and a Supratek Cortese Preamp. The components sound very good but when I listen to classical music I would like to have a little more push when the music goes from a soft passage to something loud.
I don’t want to lose any low level detail , that the Frankenstein amp is known for, or as little as possible.
I have $4000-$5000 to spend on new or used.I can’t afford the Dragon II amps they are 10K, and that is out of the question but if I had the money that is what I would get.
My question is will a more powerful amp help or if I changed the preamp would that give the classical music a little more up front push? I want a remote control and phono with the preamp.The Coincident speakers and amps sound very good, My system never sounded so good , I hate to mess with it but if I can make the classical music a little more dynamic I’ll be all set .
I’ve only had two tube amps in the past one a 300b and the other a 45. Is there another tube other than the 300b someone can recommend ?
I’ll keep the Frankenstein until I can find and amp that has the low level detail of the Frank with more power.I may keep the Frankenstein forever it is that good !

Any suggestions are greatly appreciated, my listening room is 12 feet wide and 17 feet long with 7.5 feet ceilings.

Abill