The stat weights for all classes so far have shown Crit > Det > SS in terms of damage weight with them all being somewhat homogenized in output. Where is Dervy when you need him?

Beyond that due to the lack of same ilvl gear and the high value of str after reaching the vit meta, there is no instance of min/maxing that becomes relevant at this point until more pieces are released. You should always be going with the higher ilvl item for now.

As far as the secondaries in themeselves:

The testing for SS and its affects on dots has shown that the increase in damage is very minor at the current ilvls. This may change in the future as we acquire higher stat caps, at one point the same thing was shown with det and its damage increases but as we leveled higher and acquired larger amounts the difference began to show at higher levels.

You also need to factor in the changes to crit which are pretty big as now crit increases the damage of crits and the rate of crits as opposed to just the former. This means that with or without a native crit rate increase (Internal release, battle litany, dps stance) crit will retain a high value.

As far as SS goes on a drk i believe that Blood Weapon to lessen it's total weight. Then there is also the TP floor which creates a point of very limited returns and the fact that while BW does lower TP consumption the Drk still has no native TP regen cool down or CC skill. SS in practice seems to be a stat that has a "sweet spot" on a lot of classes in regard to allowing x gcds under a certain cool down or dot timing but I've yet to see any tests or theories on this for drk. It should be balanced against the tp floor if no other prevailing factor can be cited.

Determination was nerfed but from all of the weight tests I've seen so far it is still heavier than SS.

There is little room for secondary trading on a horizontal level at this point due to the weight of Str being fairly huge in comparison and a lack of comparable sets in terms of ilvl. Currently the pentamelded 150 slaying accessories melded with vit provide the highest weights for right side total and the there is only one set of ilvl 200 gear so min/maxing "like" sets of left side gear isn't really possible unless you have access to the 210 pieces and the materials to upgrade the eso gear. I do think we will be getting a new 200 set with the 24 man raid coming out so this will likely provide us with a lvl 200 min/max set outside of the raid.

TL;DR
The high weight of Str and the lack of comparable ilvl gear makes min/maxing as simple as choosing the highest ilvl piece available and until we get more than one set at a certain ilvl this isn't going to change. I've yet to see a single left side tank piece were the secondaries from a lower ilvl piece outweigh the main stat increase from the higher level piece so you should absolutely be going with the highest ilvl item as meeting the accuracy cap really seems to be a non issue with the gear sets available.