When it comes to scanlating etiquette usually the rule of thumb is if the manga/manhwa hasn't been updated for 3+ months or if you can upload high quality chapters faster than the other group who hasn't updated in awhile then you can take over. Unfortunately, SLC was facing heat from publishers, which might be why they haven't updated their webtoons, but that information isn't readily available to people who aren't familiar with them (like myself). Also, it's kind of difficult to find information about them/their status for the average reader. I think you can join them and continue or do it independently, but most readers likely don't think what you're doing is inherently wrong since you provide decent quality translations at a very fast rate, and we don't really know SLC's situation very well pertaining to this webtoon.
I don't think many care much about redrawing everything perfectly (sfx notes are sufficient), personally I found your translation clean and easy to read. As a reader I'm happy this is getting updated, but I get the dilemma. But like you said you've come so far, and everyone - including myself - seriously appreciate your fast releases and would love to see you continue, but hope you don't get bogged down with the publisher issues (fingers crossed).
Anyways, thanks for updating this so quickly, we've learned so much more about the characters. I'm so curious how the story develops especially between Suri and Jeremy.