The drums sound flat? What do you mean with that?
I'll try a version with more reverb on the snare.
You should probably lower the volume of the kick and snare so that your drums sound more 'intergrated' in the song if you know what i mean. Just my 2 cents mate
edit: after listening to it again, maybe add some more bass/low end to the kick, perhaps an 808 below it with the 'out' knob at about 12 o clock?
Listen: the bass contains quite some sub, so throwing a sub in my kick would cause phasing issues in the low end.
If I lower the volume of the kick and snare the sub becomes to loud compared to the drums, if I lower the sub there isn't enough sub bass in it.
So I'm probably gonna stick with this setup.