What to do with an Audio Note P2 SE?

In an effort to downsize my system in order to simplify my life and appease my wife I'm now using an Audio Note P2 SE as my amp. It's about 7 years old and sounds great! It seems to have enough power to drive my Tannoy D500 speakers, and it seems dynamic enough without using a preamp, though when I did briefly use a preamp the bass improved. I'd say it sounds great with most music; it just lacks the visceral impact of rock. Paired with my AN DAC it makes great music.

Anyway, on to my point. Space for the components is limited. I'd like to add a preamp if possible, if only to be able to add a tuner. But the added dynamics would be a benefit. What preamps are a good match for the AN P2 SE? Is the AN M2 preamp a natural? Is the Soro SE integrated an option? What other brands of amps/integrateds might be an option, pref. tubes but I'm open minded? I must say, though, the Audio Note products always impress me and I'm beginning to become a real fan. A real fan of SET amps too.

The volume control on the P2 SE is scratchy when turned, but otherwise quiet. At full volume there is a lot of hiss coming from the left channel, but I have not been able to ascertain if this is form the amp, DAC, or because of the tangle of wires behind the rack.

This system sounds great! But if only I could add inputs and up the dynamics just slightly I'd be done. Any thoughts? Stick with what I have? Add a preamp? Shut up and enjoy the music? Thanks.