i just spent some time overlooking all the artifact traits considering Execute or no execute use. sup 20 % ideal play will probably be cs- execute-ms due to precise strike making a 40 rage execute for 23 rage, wiht a 15 % increased crit chance, which will be better than a 13 rage ms, even if u factor in that u have a 40*.65 % chance to proc tactician from the execute, aka wasting one ms. i think the precise strikes is not really well reflected in the models, it has a huge impact on dpr ratios.
kodus to the game theoretics guy that could give actuall numbers about this