You have a stable system with good hashrates and zero problems, but the number of shares per card is very low.
10348 shares / 74.75 h = 138.4 shares per hour
138.4 shares per hour / 13 cards = 10.6 shares per hour per card
Normal for 580/570 is 25+ per hour.
You sure you saw those shares per hour for 10000MH difficulty? And not 4500MH or something lower?