Geoff
I had the same problems on the Tyros 5 and my S975, I miix my strings with live strings and movie strings, this makes the string sound warmer, try without the harmony button down, if you want more fuller stings press the harmony button down.
I think you will find you have the same problem on the Genos, you have to mix the strings. My old S950 came out of the box with with lovely strings, in fact very little mixing was required. Try this method, see if you like it.
Steve