But I'm wondering if I maybe missed something, or if it's understandable given that the issue I worked with is basically part of the biggest issue I have in my life.

I don't think it's a problem. That's just the way it is sometimes. There seem to be limits sometimes as to how much vibrational movement you can make on a subject. Go beyond those limits and you can encounter increasing resistance to further change.

In the Focus Blocks Method, this is why you break off from doing a Focus Block when you encounter this resistance in vibrational movement and come back later, instead switching to working on a different Focus Block. This is why I prefer to use Focus Blocks instead of Focus Wheels...Focus Wheels are more a clean-it-all-up-now method whereas Focus Blocks let me flit "hither and thither" every time the going starts to get hard.

It seems that sometimes, one needs to just stabilize at a particular vibrational setpoint for a while, perhaps go live some life and have some physical experiences at that setpoint, in order to then have access to the higher levels on the emotional scale for that subject.

I'm basically saying, don't worry about it - just give it some breathing room and come back later :)

When you come back to this topic at some future date, you may find that you can suddenly make easy movement on it again, as though some new level in the vibrational game has opened up.

Answering mostly to your title:

I would rather recommend to transfer the quality of the emotions, than bringing them down. Then I am able to enjoy the worked through energy as much as I suffered from the low energy, if not more.

When they come again, for me it really matters how I take it: at least two models of life are applicable here. One is, that the "bad emotions again" mean it's kind of my fault that I cannot hold on to the good ones, that I didn't come to the good feeling point of view in a stable enough way. This is how I perceived what Abraham and Bashar say.

But later on I developed a different model, and I applied in it what I heard from Abraham, too - they say that we cannot always be in the Vortex since the energy, the world is always expanding.

So I said, these new emotions are not the old ones coming back "until I clear the issue", they are a new development of this stream I'm working with (in the certain subject). They mean new energy arrived, and now I can align to this new energy and feel even better in this stream.

In this second model, life is cooperator of all my streams giving me a better and better experience, since the streams always expand, I align to the new energy and then I have an enriched experience.

As always, your choice. :)