Actually I don't think EQ is the problem here. As you said "instruments goes on top of each other". It's more writing itself, rather then EQ'ing. Instruments choice, note's harmony etc.
Also reverberation causes some bad effects to overall mix pretty often. And, almost the most important thing is BALANCING! Right, left, center, right-center, left-center, louder or quiet..
Here:
I used multiband compressor for your stuff. Is that better, or just louder?
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