Dimension line styles changed when copied/merged/exported to V8i for flattening drawings

As the title suggests, we are having an issue where dimension lines that are inside of our reference files get changed some when we try to flatten our files into a single file for project turnover purposes.

The issue:

Some of our references are created outside of the OBD/Microstation environment and exist in dwg format. We are trying to flatten these files for a few reasons, but the primary is for document turnover at the end of the project. Unfortunately, the dimensions must come from these dwg files as they're linked to the geometry therein that can and likely will change, and so we can't hide them and then place our own dimension lines because the intelligence would be lost and we'd have to spend extra time reviewing and updating these dimension lines in dozens of drawings anytime changes are made.

There are two specific issues:

1) Dimension lines that register as "too small" for terminators and text to fit between extension lines and automatically create leaders as a result despite this not being an issue in the source file (text and terminators between extension lines)

2) Dimension lines that already have leader lines whose leader style and even position is completely disregarded.

Because the dimension style doesn't explicitly exist in dgn format or the dimension styles library prior to flattening, we cannot change anything about how it appears in the final product prior to flattening. And since the flattening is automatic and the contents are subject to change, we can't go back and change the dimension styles after it's flattened because these changes will just get overwritten. I could be wrong, but I don't think we can even reliably add the resulting dimension styles to the library because the name is generated when it's converted to dgn format, and any time we have a different combination of name elements we would get a "new" style.

I have tried exporting to V8i with merging turned on for references, simply merging the references in a copy of the master file, as well as selecting them individually and doing a copy/paste action (I assume the software method of the latter two are very similar, but wanted to try both to be thorough). They all result in the same erroneous looking leaders.

The images below show the result of my attempts thus far, with purple dimensions being the original and the white being the one that is created by the merge:

    

My Question:

Is there a way to control the imported dimension style to appear at least closer to the original? Key things we'd like to keep are the arc leader line, orientation of the text relative to the dimension line, and the general location of the text (some shifting is fine, but it needs to be close to avoid interfering with other drawing elements as with the first image). Otherwise, is there another method of flattening our files that I haven't listed as having tried that will give us a better output?

Any help would be greatly appreciated!