Dan Craft Sig V 9' 5 weight question?

#1
I'm getting ready to build up this rod. This will be my second Dan Craft Blank and so far I'm nothing but impressed. My quetion is has anybody tried a 4 weight line on this rod? I'm curious if it would still load it and give it a bit more speed for fast casing strokes (impatience)?
Let me know if you've tried anything,
Thanks,
Tim