User blog comment:Luxionmk2/Poison DOT figured out... I think!/@comment-4073118-20120827234737/@comment-5007614-20120828075148

Yup. Chem Trooper: 45-75 averages to be 60 damage, which coincides with the first damage tick. 60/3 = 20.

Sandworm: 41-69 averages to be 55. 55/4 = 13.75, rounded up to 14.

My Hunter math will work if we do round the lowest damage "OFF" instead of "DOWN". Anyways, working on ranking up artillery units to see if the chem shell damage matches my theories :) Easier to promote than Chemical units and sandworms :P