350 might be too high.  Try 340 or try a different build.
Your rejects are high:
A: 593920 R: 26624

Mine look this after approx 12 hrs.
A:1067162 R:7752 WU:1507.6  Beta 1
A:1134848 R:1536 WU:1489.2  Beta 2

That's two different pools.  Beta 1 or 2 will work on one pool.  The other pool get a lot of rejects with beta 2 so I use beta 1.
Are you getting what people are calling a wall of rejects once in a while?  That's what I got on one pool with beta 2.  But beta 1 works on that pool.

Beta 3 was released last night: - Dmaxl's CGminer-4.3.5 Beta 3