I'm thinking it could work like this:
It works like a normal Enhancement Scroll, except that its Success rate will not decrease and it has a lower destruction rate. However, it starts off with a lower success rate than the Enhancement Scrolls (50% or 30%). However, if the equipment it's being used on already has 5 or 7 stars, its success rate rises to 70% or 60% respectively (for the two different scrolls, of course).
In other words,
If <5 stars,
50% Scroll: 50% Success Rate
30% Scroll: 30% Success Rate
If 5~6 stars,
50% Scroll: 70% Success Rate
30% Scroll: 30% Success Rate
If >7 stars,
50% Scroll: 70% Success Rate
30% Scroll: 60% Success Rate
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