I know this is mad late, but I had the same issue on my G6+ and I found the issue
it was my EQ
I would go for the nexus 10
Just installed on arc s with locked BL. Wipe all (dalvik, cache, system, mount and storage - system, data, cache).
It seems very fast and battery frendly :)
Will use it few day and post impressions.
The omen lockscreen looks strange...
I'm not keen on the skin, but I would love to know how you did it.
As I would love to make my own.