Proper Rope Clutch Size

[Patrick_Seattle]

I'm looking at Lewmar D2 Rope Clutches and two of them can fit my line.
The diameters they support are as follows:
5/16" - 3/8"
3/8" - 7/16"

I'm using 3/8" Stay-Set X for my halyards.

So the question is does the smaller clutch cause more abrasion?
Will the larger clutch be more prone to creeping?

What Would a Rigger Do? (WWRD?)

Thanks!
-p