Yamaha CS80

My CS-80 ownership just dates back to one month only. Although I am 
immensely impressed by the CS-80's musicality, there is one point that 
still remains quite unclear to me: The usage of the String 1 and String 
2 presets... 

I have found the other presets to be generally quite musical and 
effective. But what about the String1 and String 2 ? How do you use 
these two presets? I find them very bright and harsh to layer each 
other in a dual strings patch or to layer any other sound that the CS-
80 produces.
Lessening the brightness does not even help much.

Ironically, this poor combination is the first sound you hear every 
time you turn on any CS-80. 

Do I miss anything about this sounds? Could Yamaha have wasted two 
valuable memory locations by two awful string sounds on a synthesizer 
that can actually produce breath taking string sounds?