My S4 is not performing as expected. I only see 1800 - 1900 Gh/sec hourly ratings on Slush so far.
Have been checking the average for the last couple of days but can't see any improvement.

I tried minimum difficulty at 2048 and 2250. No real difference.

Anyone seeing similar behavior ?

The funny thing is that on the S4 internal stats page I currently see like an average mining speed of 2002.39 Gh/s over the last 3 days.

Slush:
xxxxxxxxx    x    0    355500    3139621.50955    0 minutes    1806.571    2250

versus

S4 internal stats:

Elapsed    GH/S(5s)    GH/S(avg)    FoundBlocks    Utility    LocalWork    WU    BestShare
                     
3d3h14m53s 2845.66      2001.94        0             11.84         158480049 27975.18    153414510