I don't either - can't blame you a bit.
If all the other feet are doing what they should be doing, then yes, go ahead and try a different darning foot.
My very favorite darning foot is this one:
http://shop.sew-classic.com/Low-Shan...t-SCF55417.htm In fact, I bought a half dozen of them thinking that at $3 each, I would have to replace them frequently. But noooooo... I haven't worn one out, yet! LOL!
If you've got a standard low-shank presser bar, this foot gives you really good visibility, it's very quiet and it's apparently indestructible, too. :mrgreen:
Good luck! :)