It's quite a task to come up with a PERFECT mix inside the arranger, IMO. A lot more convenient, perhaps, but there are SO many things that are difficult to balance against each other. For instance, can you EQ each drum differently inside a kit, or do you have to make a blanket change? Are the frequencies variable enough to dial in each sound correctly?

My workflow with what I record tends to be to get the basic style part as good as it can go, but then I save as an SMF, and then start to play it from my DAW. At which point, I can solo different sounds, even certain drums, and record them as separate track as audio. This allows me MUCH more flexibility with effects, EQ and compression (if it needs it) for each sound individually (not to mention, this is where you can start to vary the fills a bit, make bassline corrections to lead up to chords, etc.). Is it a lot more work? Sure. Is it worth it? IMO, yes...

It's obvious that you heard the cymbals issue already, yourself. But, because of your workflow it must have been more work to correct it than you wanted, and you posted the demo that way anyway. But you never know who's going to listen, and putting your best foot forward, even if it takes longer to produce, is always a good thing...

Arrangers are already a big shortcut to making a decent track. Having been given all that extra time, perhaps you could use some of it to correct what can't be done entirely inside the arranger?