You link isnt adjusting the difficulty prozentually i believe. For a static test with no diffi at all i use this: http://www.alloscomp.com/bitcoin/calculator
Of course it makes only sense for looking at a day.

My bitburner run with settings: 28ms, 450MHz, 1334mV, target temp 30°C and it runs with 53°C giving in average 43.8GH which means 8.76GH per bitburner xx.

Its the best setting i found till now.