Hafler IRIS output level question

I finished recapping an IRIS preamp. All new electrolytics, all the tantalums swapped for electrolytic as well. As I put some hours on it the sound is coming along nicely but I notice that the output level is a lot lower than any of my other IRIS preamps at the same volume position. I have to turn this one up past halfway to get it to normal/loud listening. The bass seems a bit more rolled off as well.

No distortion so I don't think I have any failed parts. Is there a way to raise the output? Maybe those 4 adjustment pots that I see on the mainboard?
 
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