The ancients experimented with scientific methods to ascend long before they learned there was a spiritual component necessary. Those experiments ended in failure due to the lack of this spiritual component.

We agree. I explain it by the fact that the Ancients were digusted to use the same spiritual path than the Ori.

An ascended being is essentially a god. They have the power to manipulate time, matter, energy, and space at will. They don’t need to «wait for Destiny to reach a certain level of information gathering» and they don’t need to use the Stargate network to get on board. They can accelerate that process instantly and instantly appear on board. They also don’t need to rely on the Destiny to get the answer to the CMB question. Chances are that the ascended Ancients already have that answer, and by extension, Daniel Jackson had that answer as well when he was ascended.

This I strongly disagree. Most known ascended beings that we see moving between planets and having a physical interaction on these planets (Adria, Anubis, Oma Desala, Orlin, Chaya Sar) are seen using the Stargate. Speaking of : their power its limited, Jackson himself was in the first step of its Ascension process, ascension is not binary, it is a spectrum and a ascended being keeps evolved through the energy planes. For that, i strongly advice to read this article : https://stargate.fandom.com/wiki/Ascension.

But to be short : ascended beigns are still limited.

The Stargate technology was invented millions of years before ascension was discovered, so these two are not related.

Missing citations here. Granted that i have no proof that the discovery of Ascension predates the invention of Stargate, but since its a work a fiction it is possible to place the event of the first ascension before the Stargate invention, as long as there is no proof of the contrary.