Although the 'three finger method' is the comman way for folks to check chain tension, to be certain you are correct you must first set your cantenary sag properly and THEN see how many fingers you have.
With different finger sizes, slight differences in bike sags, and slight differences in sprocket sizes, the only way you can be certain of your adjustment is to first set the chain sag properly. Do it only once and then just see what it is when you get the bike down on the ground in a normal situation. Do a search on cantenary sag if you want to know how to do it.
btw...The D.I.D ERT chain has plates with tensile strength of 8,470lbs, the R1 Renthal has a tensile of 7,650lbs. Both are gold chains, and both will serve you well.