At clock speed 291, LL hashes about 12.8mh/s, 444 watts, still 6% HW errors.
Also, < 1% rejects on clevermining.
I don't have a power meter, could you try at 10.4mh to see what the power use is compared to gridseed blades? And are you using original firmware, or the upgraded one availabe? I haven't upgraded myself yet because jjj0923 said there was some kind of problem with it.