Hi,
Yes, done mostly the same things and got Minthara.
And the ordering is doesnät metter.
I attack goblin, then with not lethal attack fight with minthara.
Then killed other goblins and bosses.
The quest with tiflings was complete, but i don't celebrate it. And Helsing stay in grove.
Then, i goes to the Act II, I saw all tiflings with his quests, i save the Minthara in the temple.
- BUT, the Helsing is in the grove, and when i woke up the flaming fist, my hero told, the Helsing in the goblin prison.
And, then i goes back to the Act I, and told Helsin about the flaming fist, Helsing answer: I need to speek with him, i will see you in the Last light.
I goes back to the Last light, but i didn't find Helsin... Maybe he goes by foot, and as i know, it can spend a few days, as Last Light in the middle between grove and Baldur's Gate

I will be a little bit happy to remove dark curse, and save Minthara and tiflings, but for me it's enogth to save Minthara and tiflings.