Yeah that's on the high side, but it depends on your miner quality and ping distance to the node you are mining at.
Also see above post.
Looking over some of my miners i noticed that the block % seemed to have a greater dependence on valid /invalid then hashing rate. or was that an optical illusion? lol
I was researching a odd reading from an S4 (was getting 2.4 with stock PSU) Looking more I found that when setting Voltage I accidentally deleted the 7 0725 under voltage I and apparently other then high 1.5 invalid Stale nothing else was showing up bad.
http://i68.tinypic.com/smg2mo.jpghttp://i66.tinypic.com/24uzqzr.jpgStrangest thing is other then the stale reject rate being high everything else looked ok,,,,, so far that is.
But when i corrected it my invalids only dropped to .90 I thought i was on to something I guess its back to the drawing board if anyone could point me in a good direction I would be very thankful
PS
I looked again and some were over 25% stale and almost started yelling at the till i realised BLOOOOOOOOCKKKK . someone do the chicken dance lol