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If he can't fine up the grind, upping the dose is all I can think of. Oh, some units you could tweak the pressure to maybe handle the finer grind but that's getting into modding territory.
When I had working scales I'd be around 17-18g, 27-28s, 2x30ml shotsSince I'm now using the home machine again and using proper beans (thanks Steve) I want to get some scales back in the mix to tune it up nicely.
hippy
What weight are you getting out and in what time? If you're getting ~30g out from your 15g of coffee in 30 seconds or a bit less and it's sour you can up the dose. If it's taking much less time to hit 30g then a finer grind is the way to go but you could also up the dose a bit. I usually do 18-19g in for 36-38g out in 30 seconds.