Alamo-Girl,
Your thoughts on dark energy, gravity and planet formation are intriguing.
When considering the counter-action of dark energy and classical gravity, I think about other instances where two known forces are in play and counteract each other.
OK...Strong force vs electromagnetic in proton-proton fusion: The strong force is more powerful in shorter range, while electromagnetic is weaker but has longer legs, and would be more cosmic (unlimited) in its effective distance reach were it not so bi-polar.
AND...Millikan oil drop: gravity vs electric (long range and weak vs short range and stronger).
BUT...Dark Energy has longer legs than classical gravity. Because you are looking at gravity-repulsion effects in a shorter-than-cosmic range, I thought of the EÖTVÖS EXPERIMENT: One hundred and three years of repeated experiments investigating the un-proven evidence of a (proposed) weak repulsive force that acts in a distance range of a few meters to a few thousand.
Link:
http://www.kfki.hu/~tudtor/eotvos1/onehund.html Eotvos is serious classical science. The experiments repeated in the last few decades look at a different (lower force of gravity exhibited) based on the spin number, baryon number and other nuclear properties apart from the mass of the object itself.
The great difficulty here is the experimental apparatus and measuring gravity at very close ranges.
Anyway, the challenge will be to learn how Dark Energy really works.