One technique for making "high end" celestial styles is to start them further along on the essence curve. For example, perhaps the first charms need Essence 3 or 4 instead of two. For example,
this style makes use of that technique (perhaps a bit excessively). The trick is that you shouldn't go that high (Essence 5 at max, maybe 6) as beyond that you are treading on sidereal territory.
Note that there are also some philosophical differences in how the levels of MA are designed. My personal take on it is that terrestrial styles gain power from
applying lessons learned from a concept. Celestial styles gain power from
emulating a concept. Sidereal styles gain power from
wielding a concept. This is to say: a high end celestial style should "feel" quite different from a low end sidereal style.
As for Gentle Embrace, the mix of the title and the notion of harnessing Oblivion suggests to me that the style might be fairly subtle, suggesting the type of "mental surrender" that ghosts go through when they decide not to be ghosts anymore. One question might be "what is being emulated"? Does the martial artist strive to act like the siren call of Oblivion? Or maybe it is slightly more literal, like an embracing lover.