it doesnt fucking matter how you minor because if you use more mana than you soulpot, you will go oom. 5 years and the tards here still haven't realised that. The reason people use dual isn't because it's better than single, it's because they can't do single. If you can do a good single minor (8-9 per second) then dual is pointless, it just wastes a bar spot. HP pots are very useful if you have to cure or cast magic shield a lot, and also HP pots are better burst healing than dual minor, in those cases where you will die fast otherwise.
The only scenario where dual minor is an advantage is 1v1 with warriors (at least at lvl 70) because the fight is so short and the incoming damage so constant and sustained that you should aim to be oom in around 20-30 seconds and often single minor doesnt drain ur mana fast enough. Otherwise single minor is superior in every regard. Rogue 1v1s are long so you need to control ur mana, BP 1v1's are bursty and u have to cure a lot, so HP+minor is best, mage 1v1s are also quite long if they slide so u must control your mana.
Also a lot of people just assume single minor is bad, because they've never fought someone good at it. Cardinal was the only rogue i ever fought who could do it the same way (i actually learned a lot from him) and frankly I don't think any rogues have surpassed that standard since. And if you want to learn single, don't watch videos because its hard to do it while recording. You just have to take my word for it that it works.