How about this:
Overshoots only happen on natural 6s, meaning if you roll 5+1, it's better than a 5 but doesn't have the massive drawbacks of a 6.
Artifacts provide at least a +3 bonus, their bonus drops each time it's used, and are completely consumed when they fall bellow +3.
You can use artifacts to make more, but they can't have a higher bonus then the one used to create them AFTER the act (max equal to whatever the one used minus what is consumed), EXCEPT on a natural 6 or 1 - except that the new ones are warped and have drawbacks (try to make a race of humanoids (an admittedly weak effect, but common)? Well, they are cannibalistic, want to conquer the world, and have an affinity for other things created by or related to the warped artifacts). Warped artifacts can create less warped Twisted Artifacts, though, which can then create pure artifacts (normal), but then you've either got to save or destroy the warped ones, and destroying them is impossible without... artifacts of destruction. And if you roll a natural 6 or 1 when trying to create a less warped artifact with a warped one, you get an even worse one.
Most actions will succeed with an artifact, due to a guaranteed 4 or more (1+3=4), including "Make 7 artifacts". However, the more done with the roll (7 artifacts compared to 1 or 2, or making a solar system or GALAXY compared to a planet or asteroid belt), the less powerful or whatever each individual thing made with it (Using a +7 artifact of creation to make 7 artifacts or 1 artifact, on a roll of 5 you get either 7 +3 random artifacts, or 1 +6 artifact (and the +7 becomes a +6); on a roll of 6, you get 7 +4 warped artifacts or a +9 warped artifact).
If TRYING to make a warped artifact or other object, then it will be even less powerful then normal, even when using a warped one in the process; natural rolls of 1 or 6 still warp, and all others do when trying, but only a natural 6 can create a more powerful artifact than the one that spawned it.
Using more than one artifact at once, they must all be in the same cattegory(s), and the first one is always the most powerful, and at 1/1 power (full power), and you get the full bonus. The second one is the next most powerful, and at 1/2 power (half the bonus, rounded down). The next one is at 1/3 power, then 1/4 power, 1/5 power, etc. This can be used to have a much higher bonus and if you're creating another artifact, then the maximum bonus is the combined total (after part of the bonus is consumed) (If you have a +9, a +8, and a +6, then the bonuses added to your roll are +9, +4, and +2, or +15 all together, and the best artifact you can make without warping it is a +12 (15-3)).
Remember - Only creation artifacts can create other artifacts, and the newly made artifacts will either be random, or less powerful the more specific the player making it tries to make it.
That about covers using artifacts to spread the artifact joy around (make more artifacts); doesn't cover making other works.
That's my idea on how it could work.