I have listened to this song so much. Thank you.
First, I listened to the render. Then, I listened to the IT using libxmp and noticed cymbals crashes were much louder. The crashes were also louder with it214v5.
There are also two, consecutive, one-row patterns starting at 0x23 in the order. Here, the sliding notes (all the same pitch) in channels 0x10, 0x11, and 0x17 are really, really loud. It's extreme constructive interference... but not in the render. I'm unable to confirm this one with it214v5, as this section of the song makes DOSBox chug hard.
Can you provide any information on the render and tracker used to make this excellent song? Best of luck with votes. You deserve top format, at least.