No tweaking here. Two production units out of the box. No down time for 6 months. Overclocked to 1.25TH/s.
If that's the case, & you're using bitmains cgminer - you're losing potential earnings. You should use kano's cgminer for the S5 instead as mentioned a page or so back

Edit: Just a heads up - Matt Corello has released an updated version of his excellent relaynodeclient with some huge performance improvements - p2pool users can benefit greatly by using his software:
http://bitcoinrelaynetwork.org/https://github.com/TheBlueMatt/RelayNodeNice stuff Matt

Been using it for quite some time on my node.
Songminer, I highly suggest downloading and using -ck's cgminer for the S5. Bitmain's throws away potential block solving shares.
So, how do I go about doing that on the S5? Has anybody posted a good instruction on how to do that?
Thanks.