2 channel preamp for music only system

Hello everyone,

I’ve been reading posts and responses and have been in awe at the quality and detail of responses. 
Recently I decided to repurpose my Adcom GFA 555 as part of a 2 channel music system using my HT receiver zone 2 as the preamp. The normal pre outs would require that I go into setup each time.  I quickly determined that I would be better off by adding a dedicated preamp to the system. 
When using zone 2 with the Adcom, I have no volume control, yet it doesn’t seem very loud. 
I guess my question is, with a preamp, could I expect more volume?  I’m streaming using a blusound node 2. Seems like a 200 watt per channel should play louder. 
For example, my HT speakers are Focals with a similar spl to the JBL’s, but play significantly louder than the JBL’s yet the amp is of a lower power.
 

2 channel system current configuration…

Pioneer Elite SC. LX 901 (using zone 2 as preamp)

Blusound Node 2i (streamer)

Adcom GFA 555 (power amp)

JBL L100 Century speakers

I’m thinking of adding either a Parasound or Adcom preamp (budget under $1k) but would love to hear suggestions from you or ways to make the Pioneer act as the preamp without having to change settings (turn off home theater speakers, change subwoofer volumes, etc.)  

thank you!