That makes me feel better. I have one (of two) left from Wes in 2005 and two (of two) from 2007, and my biggest is probably 8" and the smaller two like yours, about 6".
I do under feed, but others here have openly wondered why mine are so small for their age.
I guess this is par for the course, if not aggreessively "growing them out".
Mine show the relative blunting of colors too, though at times they are as sharp as ever. I miss the orange noses.
Are you the original owner (after Wes)?
See my link below to see mine.