opus 300? Wow!!
I would add more double stops in the first one, especially because of the ninth in measure 6. If you want to have a few double stops as an effect, then they should be smaller than a sixth or so. Bigger intervals only work if you are adding another voice (aka polyphony).
In the second one, change the sixteenth followed by rests to eighth notes marked as detache, or whatever accent you want. It would much easier to read that way.