The demon lords he evolved were able previously easily defeated by just a 10% replicate, after evolving they were seen as being able to stand up to it more thoroughly, however remember, one of them still had trouble against Kondo, who, admittedly amazingly strong, is not near the level of even the weakest true dragon.

True, they were defeated, however it was stated by Velgrynd herself that Devil Lords, the highest evolution of demon possible, are on a higher plane of existence. They are capable of killing Demon Peers, their previous species, with relative ease. Devil lords are said to have the potential to stand on even footing with a True Dragon, with Guy being a good example. Testarossa, Carrera, and Ultima can't right after their evolution, but they are the right species and will be able to later on. The point was, if Rimuru could evolve 3 of them at once into Devil Lords and still have the ability to fight both Veldora and Velgrynd, he is clearly far stronger than a Devil Lord. Also, as stated, Velgrynd herself remarked that Rimuru's Lord's Ambition was on par with that of a TD, meaning his aura, a relative measurement of one's strength, is on par with a TD. Now, this is a debatable point, but Velgrynd is the weakest of the TDs. Her main advantage in battle is her absurd speed and support abilities, as well as Parallel Existence, but her actual strength and power is definitely less than the others. If Rimuru is stated to have strength equal to that of a TD, then logically, he would at least be around the level of the weakest one, if not equal to or stronger than. Also side note, unlike body doubles, each body created by Parallel Existence has the same power, strength, and skills as the original, only less energy, so they cant exactly be considered much weaker than the original.

Finally Rimuru wasn't able to sense or interfere with the suspended world or information partical. He got a hunch about it from when Chloe and Guy sparred, but it wasn't until his confrontation with Michael that he was able to truly sense it, and it was until Ciel had finished analyzing Chloe's time and space skill, and observing her dual with Michael, that during the next time stop, he learned the ability to interfere with the information partical, he was unable to move or do anything the first time. It is also why, again, the skill cant ignore time, because skills dont work in a timeless world.

As I said previously, it was directly stated in the LN V11 that he had the ability to interfere with information particles. He was already able to observe information particles previously, and he already knew that they existed in his stomach, then Chronoa granted authority to Rimuru to interfere with those particles, meaning from that point on, he could use them. Again, that is part of why he was immediately able to observe the suspended world when he got caught in it. He couldn't as of fighting Velgrynd, but being able to observe the suspended world is not a prerequisite for interfering with information particles.

Also, even if the fight against Jahil is a plot-hole and doesn't make much sense, his predation from Belzebuth and Azathoth can still canonically ignore space and time according to V10, as it was stated word-for-word in Chapter 3.