Just going by my own ancient experience working with DX7s and similar 
synths. When the modulating wave form is not an even multiple of the carrier 
wave, you will tend to get more metallic tymbres. I don't know what's going 
on with FM synthesis these days, but <old geezer voice> back in my day, all 
we had was sine waves to synthesize with-- and that's the way we liked 
it!</old geezer voice> And as such, if you wanted something closer to a 
sawtooth wave you would add harmonics on the octaves above the carrier.
To get something more akin to pots and pans, one might add harmonics that 
were 1.5 octaves above the carrier, etc.

Of course, none of that may make any sense to anyone. ;-)

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