Nice use of Cinematic Synthetic Drums (or Juggernaut-free)! Personally I think there's a bit too much treble going on; the snare is lofi, and it mixes in with the digital arp (from 0:40) and creates a constant, upfront lofi texture that ultimately gets grating. I think you should pick something you want to keep that trebly, and low pass the other instruments near perhaps 12000 Hz or so.
This sounds to me like it wants to be a chippy, ambient, chillout style. You might want to try bringing that snare (the one that has more treble) back further by lowering the reverb dry mix a touch so that the drums are closer to each other in terms of depth in the stereo field.
I do agree with you that there's definitely still clutter. I don't think it's too washed out, but I do think there is currently a large amount of midrange going on. Anything that's not leading, you can stand to lower the midrange even a little bit. Anything background definitely counts towards something that doesn't need a whole ton of midrange; just enough to not be too hollow is all they need. I can kind of hear what's going on if I really try, but the treble clutter is distracting me from doing that properly.
Arrangement-wise, you're probably valid on the source breakdown, but I would take another look at the flow. The dynamics need to change more to give the listener a break from the "main" portions. If I look at what you have to drop off the dynamics, you have 2:01 - 2:03, 2:21 - 2:43, and 3:00 - 3:02. On top of that, I hear hardly any obvious transitions, and partly due to that and partly due to the way the arrangement goes, it's hard to tell where the remix wants to go; there's a lack of direction. That seems to be a common issue. Try not to have wandering melodies, or new sections that don't start with a transition element of some sort.
And as a general rule of thumb, I try to have a 'breakdown section' at least halfway through the song if not earlier. Usually I have one at about a minute in and about halfway; whatever feels right for the particular remix. For example, in this remix---one of my personal favorite arrangements I wrote/contributed to, there's a dynamic dropoff about 3/8 of the way through for about 24 seconds, and another one (a breakdown with a solo) a little over halfway through for about 24 seconds (like earlier).