guys, ran into an odd issue, need your help. thanks in advance.

cgminer version 3.5.0 - Started: [2014-01-01 22:38:28]

(5s):2.069M (avg):2.074Mh/s | A:1368896 R:26880 HW:0 WU:1901.9/m
ST: 2 SS: 0 NB: 773 LW: 11974 GF: 1 RF: 1
Connected to cage.n0nplusultra.net diff 64 with stratum as user xxx
Block: 1bb916a0ed28bc83... Diff:450K Started: [10:52:14] Best share: 1.11M

GPU 0: 75.0C 2435RPM | 512.6K/510.0Kh/s | A:337024 R:6272 HW:0 WU: 467.2/m I:19
GPU 1: 75.0C 2352RPM | 523.1K/522.4Kh/s | A:340864 R:7104 HW:0 WU: 474.6/m I:19
GPU 2: 76.0C 2238RPM | 520.8K/518.7Kh/s | A:345472 R:7360 HW:0 WU: 481.1/m I:19
GPU 3: 76.0C 2267RPM | 525.8K/523.3Kh/s | A:345536 R:6144 HW:0 WU: 479.0/m I:19

[2014-01-02 10:52:14] Rejected 2ee410d7 Diff 94/64 GPU 1 (Job '258' not found)
[2014-01-02 10:52:20] Accepted f579715b Diff 165/64 GPU 3
[2014-01-02 10:52:23] Accepted e9def790 Diff 78/64 GPU 0
[2014-01-02 10:52:26] Accepted ea1393f9 Diff 159/64 GPU 1
[2014-01-02 10:52:26] Accepted feb98922 Diff 390/64 GPU 3
[2014-01-02 10:52:30] Accepted 154ecec1 Diff 75/64 GPU 0
[2014-01-02 10:52:30] Accepted 0273102f Diff 122/64 GPU 0
[2014-01-02 10:52:31] Accepted f9495365 Diff 76/64 GPU 3
[2014-01-02 10:52:35] Accepted 4a5b3f0d Diff 129/64 GPU 0

Question:
those are my out-of-box hashrate. seem pretty low. I googled and tried to increase memory and gpu speed, but improvement is not significant, still within 500 kh neighbourhood. any idea why it is still so low? how to improve hashrate? thanks a lot.

hardware:
ASRock 970 Extreme4
AMD Sempron 145
4GB G.SKILL DDR3 SDRAM (2 x 2GB)
4x sapphire 7950 3G GDDR5
Seasonic 1050w PSU

software:
win 8 64bit
amd_catalyst_13.8_beta2
AMD-APP-SDK-v2.7-Windows-641
cgminer-3.5.0-windows

command to run cgminer.
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer --scrypt -I 19 -g 1 -w 256 --thread-concurrency 22400 --gpu-engine 1050g --gpu-memclock 1475 --gpu-vddc 1.087 --temp-target 78 --auto-fan -o stratum+tcp://www.weloveltc.com:3333 -u username -p pwd --failover-only -o stratum+tcp://us2.stratum.ltc.nushor.net:3333 -u username -p pwd

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