I have a SP20 that I'm thinking about selling and I'm semi local (South Bend, IN). How much are you offering?

So I've been mining for a few days now with my SP20 and I've noticed that I get a lot of stales. Is this normal or something I need to look at? (I'm very new at this)

Est. Speed           Accepted Shares          Stale / Dupe / Other        Last Share
1,480.63 GH/s   99,474k (99.82%)   171k / 0 / 4096                0:00:06   

I've read that stales should be a very small percentage. This is on BTCGuild BTW.

I've got a new Spondoolies SP20, I'm fairly new to mining, and I'm using bitminter. I noticed there are custom worker settings. Is this something I would need to set to get the best performance? My current hash rate is 1.45Th/s. I wasn't sure if I should set the minimum difficulty or not.

I just got my SP20 about 2 days ago and I'm brand new to mining. I'm kinda just running it full blast at the moment to see how it performs. I understand that running it that high is using more electricity and therefor making it inefficient and I'll probably scale it back this weekend.

I've got it in my basement and I can't hear it upstairs (it's in the same room as my lab server and san so it's pretty drowned out anyway). It's powered by a EVGA 1300G2. I've got it set to:

Temp Front / Back T,B
31 °C / 75,74 °C
90 Fan speed
0.68
0.68
0.68
0.68

Volt Limit 0.79

With the Max PSU:
288
255
288
255

To help keep the temps even across the board.

It's doing about 1.6TH/s. The ASIC stats look like:

LOOP[0] ON TO:0 (w:6582)
 0: DC2DC/1/:[vlt1:753 vlt2:762(DCl:794 Tl:794 Ul:789) 114W 150A  71c] ASIC:[ 85c (125c) 1070hz(BL:1070) 3185 (E:193) F:0 L:0]
 1: DC2DC/1/:[vlt1:761 vlt2:765(DCl:794 Tl:794 Ul:789) 115W 150A  88c] ASIC:[100c (125c) 1050hz(BL:1050) 3397 (E:193) F:0 L:0]
LOOP[1] ON TO:0 (w:6175)
 2: DC2DC/1/:[vlt1:738 vlt2:741(DCl:794 Tl:794 Ul:789) 106W 143A  96c] ASIC:[115c (125c) 1020hz(BL:1020) 3163 (E:193) F:0 L:0]
 3: DC2DC/1/:[vlt1:728 vlt2:733(DCl:794 Tl:794 Ul:789) 97W 133A  97c] ASIC:[120c (125c) 910hz(BL: 910) 3012 (E:193) F:0 L:0]
LOOP[2] ON TO:0 (w:6788)
 4: DC2DC/1/:[vlt1:744 vlt2:749(DCl:794 Tl:794 Ul:789) 115W 154A  71c] ASIC:[ 85c (125c) 1090hz(BL:1090) 3326 (E:193) F:0 L:0]
 5: DC2DC/1/:[vlt1:744 vlt2:749(DCl:794 Tl:794 Ul:789) 115W 154A  88c] ASIC:[100c (125c) 1090hz(BL:1090) 3462 (E:193) F:0 L:0]
LOOP[3] ON TO:0 (w:6478)
 6: DC2DC/1/:[vlt1:708 vlt2:714(DCl:794 Tl:794 Ul:789) 103W 145A  93c] ASIC:[115c (125c) 1040hz(BL:1040) 3230 (E:193) F:0 L:0]
 7: DC2DC/1/:[vlt1:703 vlt2:706(DCl:794 Tl:794 Ul:789) 100W 141A  98c] ASIC:[115c (125c) 1030hz(BL:1030) 3248 (E:193) F:0 L:0]

Besides scaling it down to save my electric bill, would there be any danger in running it like this for long periods?