Not too into or familiar with this type of metal but I'll provide what I can.
The beginning is very cool, I listened to it numerous times, so good job there, but I think you should have faded the drums and everything else in a little slower, just to get that slow but cool build feel.
To address your concerns: Mostly just troubleshooting, but it's the best I can do since I am not familiar with your DAW, or whatever it is you use to make music.
1.You could probably do a volume automation or something, quick enough to take out that click but also so the melody is continued, or you could put on bleeding on it, not too sure if that's an option in your DAW, but that's pretty much all I got.
2. I'm not too sure what you could do about that, are you working with recorded samples? if you are then you could possibly change the tempo of the sample but don't stretch or compress it any, that way it could be a consistent tempo.
3. doesn't sound that odd to me, not sure what to suggest other than trying to rearrange some things.
4.That tempo thing again? I'm not too sure what to do really, I have no experience with your music making thing so I really can't be of much assistance, I would only try what I suggested before, but if that doesn't apply to your music making thing I would try what you said. Maybe take out some crashes and see how you like it, it's pretty much all how you like it, I don't want to force my opinions onto others works.
5.drums sound a little to fast at 5:17 to me but it's not a big deal. I think the lead sounds fine, quite nice actually. I think it mixes pretty well with the next verse, but again, my ear isn't exactly attuned to this genre.
6&7. At this point I think you just need to spend some more time arranging your samples or patterns or something, If the transitions are off or tempo radically decides to change, then it's either a recording problem, pace problem, arrangement problem, or satan himself. When it comes to those things, it's pretty much on you and how you composed the samples or patterns.
I'm sorry I'm not of very much help when it comes to the arrangement and stuff, but I will say that I thoroughly enjoyed listening to this and I feel like it's some of the nicest metal I've listened to, and that if you could get some lyrics in there and fix the issues with this, I would say that this would be good enough for EQD spotlight! But that's just my opinion. Good luck with this and I hope you are able to finish it.

