Hello there!
I have gone through DMT9 Nowa's post and while I do have to agree with his reasoning, it apparently seems to have a small timing error. Not because of the timing itself, but rather the drummer's fault, mainly. The second hit is slightly off, so I guess it's "fine" to just simplify for rhythm for the sake of it? Probably yes. Supporting you on that.
The real reason for the pop is because I feel like there are a couple of things worth fixing before this map gets pushed into the ranking section, hope you don't mind. I promise you these are not hard to deal with!!
I would probably go with -3 to the current offset (138), seems more accurate.
Combo color 1 feels actually a bit off? Seems like. I would have preferred light blue, to be fair, it seems more fitting. Your call!
During the first 30 seconds of the map, you have no hitsounds. At all. Well, I'm lying, you have 5. The intro of all the difficulties feels extremely empty and with no kind of feedback whatsoever to the players after clicking the notes. I doubt this was done intentionally. 00:00:602 (3,6,3,4,5) - stuff like that cannot be ranked with no hitsound whatsoever.
I appreciate a lot the fact that you did not silence sliderslides, I would be sad, otherwise. That was a great detail. But please, do add more hitsounds to the intro and on the rest of the map, it doesn't seem appropriate to have this song unhitsounded.
(Everything posted below is referred to the Insane difficulty).
On a side note, 00:13:179 (1,1) - 01:05:679 (1,2) - do not have hitsounds, seems like a mistake, actually. These should have, especially the second pair.
01:00:487 (5) - 01:02:333 (5) - 01:04:179 (6) - etc. Finish hitsound overshadows the music way too much, it seems quite unnecessary argue. I would even say the volume is too loud in general, but I will mention that later on. Could you consider other variation for this? drum-hitwhistle; drum-hitfinish; normal-hitwhistle; soft-hitwhistle; drum-hitwhistle.
01:06:602 (1,2) - I would actually merge them into one 1/2 slider instead of this. It's taking too much protagonism 01:06:948 (3,4) - when (2) does not feel worth clicking at all, if you ask me.
Some other comments:
Volume is way too high, or that's what I find it out to be. Try 75% instead, let me see what you think about that.
Could you try a lower AR? 8 or 8.5 seem more fitting than 9 if you ask me. BPM and mapping style would be more benefited with something lower.
00:03:256 - 00:10:641 - I do get the consistency of your patterning, but I really cannot understand why would you undermap these beats. They are so audible, they are there and you not mapping them just feels... weird.
00:44:448 - Personal mostly, but isn't the intensity of the drums getting louder as the music goes on? I feel like you could have mapped them in many different ways, or rather, something more consistent. Decreasing the spacing on 00:47:217 (1,2,3,4) - , for example, doesn't seem right, either. The music isn't getting any calmer, so why would you decrease the spacing? Kinda ruins the momentum a little bit.
00:51:371 (1) - Do you need the NC here?
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Feel free to call MrSergio back after you have made some changes into it, and tell him to take a look at the mapset again, if possible.
Good luck with further processing!