Hmm...I'm not too sure about the ultimate card clip. I've always been advised to go with the original by Joe Porper. But, yeah...I'm thinking that one of those should help you out some at least. =)
Shane K.
PS...
I went on penguin magic and looked up your card clip. I still think that you should pick up the Joe Porper clip. It really is a very good investment. The workmanship of the card clip that you have looks much like the card guards that Ellusionist carries. (You know, the silver ones. They are pretty, but they don't help much as far as protection and straightening.)
A true Joe Porper clip with squeeze the mess out of a deck, just make sure you pick the right size. Ellusionist carries the original size (what you need for your Guardians) and the UV500 thickness clips for the Masters decks.
Shane K.