Well, Angelique's single-minded, and this isn't the Ang who's been through this repeatedly, she's only done this witrh Barnabas once before from her 1840 perspective, and she's just completing the job. As for it being tiresome for the viewer, I will say that they don't seem to be dragging it out. I liked the abrupt meeting with Barnabas, instead of their spending days or weeks leading up to it as in 1897 (which was great and appropriate then). She gets to work fast, radar peeled for rivals, and she settles on Roxanne and acts. I think this is why her focus is temporarily off of Julia, though she'll get back to her eventually. In the meantime, we get those strange uncomfortable looks between the two!
You brought up 1840 Ang chasing Barnabas into 1970, raising the possibility of two Angeliques existing at the same time because of time travel. She wouldn't have been the same Ang with the same experiences who followed him directly from 1795. When my eyes and weird insomnia and wrists permit (I have to mention it somewhere), I'm starting a thread on explaining 1840 Ang. There must be two of them.