I think you should re-mapping 00:27:600- 00:32:400 part, I can feel very inconsistent what you are focusing on.
I can check that you want to emphasize piano sound mainly at these parts but the problem is violin, you only followed 00:32:200 (32200|0) - to emphasize violin sound, but other parts are not.
Long violin sound can be vague to emphasize (unless you don't add LNs) but short violin sounds can be expressed like 00:08:400 (8400|0,8600|5,8800|6,9000|7,31100|7).
I can give two options;
If you worried about big gap between Insane and Extra, remove col5 anchors (#4078841 and 00:30:400 (30400|4,30600|4,30800|4,31200|4,31400|4,31600|4,31800|4,32000|4,32200|4)). I think these anchors are unreasonable.
Or remove only 00:32:200 (32200|0) to make more consistently.
The reason why the strings were represented in the earlier sections and not the later ones is because the piano does not have as much impact in the earlier sections. The later parts of the music has the piano become more impactful, so I shift the focus more onto the piano by adding more notes to follow the streams/chords, and taking away notes that represent the strings. This makes the piano feel more emphasised toward the end during play.