I can't get those picks to sound good on my mandolin at all. I get close when I put a lefty bevel (I'm a righty) on the point, but the rounded ones like the Mondo, which is kind of shaped like a Dawg, or a Golden Gate pick, just sound muffled. I like a Fender Extra heavy on my mandolin but I prefer a heavy on guitar. You'll probably try to force yourself to like the pick on your mandolin, but it probably won't happen. I've been there - you want a 15 or 20 dollar pick to work - but sometimes it just ain't happenin'. Play the pick you like on the mando, and the one you like on the guitar. The twain may meet someday, but don't fret (pun intended) if it doesn't.
"I thought I knew a lot about music. Then you start digging and the deeper you go, the more there is."~John Mellencamp
"Theory only seems like rocket science when you don't know it. Once you understand it, it's more like plumbing!"~John McGann
"IT'S T-R-E-M-O-L-O, dangit!!"~Me