rog umble hiss and measured voltage

[jrb2]

I recently got my umble up and running but I'm curious about what other builders may be setting their trim pots to, particularly what the measured voltages are on the d and s pins. I believe I've got .45 to .47V at all my s pins. Also, when I turn the gain up on Q2 get quite a bit of hiss.  I know some hiss is to be expected. I recently read that using metal film resistors in place of carbon comps could reduce hiss. Does anyone have an opinion of which resistors in this circuit would be the most likely candidates to try replacing with metal film resistors?

[Alpha579]

All of them for lowest noise, or just replace the higher values...