OK with my settings I'm getting this:
BTB 0: 38C 450 1339mV | 5.624G/4.472Gh/s | A: 25954 R: 322 HW: 54 WU: 62.5/m
BTB 1: 57C 450 1371mV | 11.66G/8.966Gh/s | A: 55200 R: 362 HW:145 WU: 125.3/m
That seems like a reasonable error rate and hash rate correct? The BTB 0 is the 10 chip and the BTB 1 a 20 chip.
Really good result so far... whats your settings? And what pool do you use?
Why don´t you use the --avalon-auto ?
So you don´t have to look the whole day at your bitburners. cgminer runs every cluster at the optimum.
I tried that with my old bitburners once and the result was far from perfect. Ill give it a try again.