In reply to John Berry:
No they don't, because the flexibility of the sling means the 'rope' krab is free to move about a bit relative to the 'bolt' krab - so both karabiners can remain oriented correctly.
Oh, and quickdraws don't add any 'dynamics' to the system at all - that's almost entirely down to the rope stretch (with a small contribution from belay slippage, knots tightening, etc...)
Its a no-brainer - stick with the quickdraws.
If you really want to shave weight off the way to do it is to spend money on light, modern 'draws, a lightweight harness and a skinny rope (which will need replacing sooner because it'll be less hardwearing than a thicker one). But, honestly, looking at the grades in your profile, its really not that much of an issue. If you're anything like me (and most other mere mortals), you can more effectively reduce the weight you're carrying by laying off the pies a bit.