On a simple patchwerk fight, DP is pretty close to the others, but it doesn't particularly shine in any scenario. I could imagine a case where it would be good, where you need to do a certain amount of damage every (lets say) 30 seconds. You might do less damage overall but if that damage needs to be done spread out, DP would be the way to go. Can't think of a fight where this is the case though, just making a point. SW and HA are slightly better anyway, and shine in several scenarios, making them an easy pick for most rets.
I track inquisition with weakauras and am actually pretty happy with how I do it (I'm an aesthetic perfectionist). Take a look at
this video and watch the yellow bar in the middle. Make sure you watch when it falls off. Its a bit complicated to put into words honestly which is why I'd rather you just watch it. If that's something you think you can work with, I'll post the strings here.
Oh and I don't keep 100% inq uptime - there are plenty of cases where its better to have it fall off for a couple seconds than to refresh early, not worth explaining the logic behind it, but the point is 92% isnt that bad. I only had 96.5% on
durumu this week which is a nearly perfect melee uptime single target fight. That's one of the reasons I switched away from CLC btw, because the logic for NOT reapplying inq is a little too complicated for the addon.