Hey Marc, cool stuff! It's a real pleasure listening - I really dig the serious epicness that shines through!
So when I say something "critical" please don't take it the wrong way. I am just saying, cause I believe, one day you'll make a masterpiece! Please stick to it!
First thing: I hate the sound of EZ-drummer
I struggled with many options too. Get rid of EZ-drummer - no don't upgrade, get rid of it ( just my opinion sorry ).
Many will disagree, but I think the best sounding solution (if you don't habe a drummer at hand): Buy really good drum samples (or pay a drummer to do them for you), than you take that pleasing drum sample library and meticulously put the samples together bit by bit, edit, edit, bit by bit... It's a pain, I know. But that is my old-school way of doing drums (that sound like REAL drums), when no drummer is there to do what you want exactly.
I really dig the slower "doom" parts and the slower melodies - just awesome! Some faster riffs got an almost swedish melodious black metal undertone - you should expand that parts. I really like it, how you combine some "Dissection", "Sacramentum" riffing, than some doomy "Katatonia" part, than some viking mosh part - if you can further melt that styles: Just too cool, really, man!
But the whole thing sounds a bit like a (great) collection of ideas - I really don't mean that in a bad way. I enjoy listening through and through. But some parts really stand out and gave a hint, what you are really able to do.
Maybe you should considering to rework and restructure the songs and add vocals - everything: Reverberated screams, growls, cleans, choirs You gave us that epic stuff - so I think it's legal to express some wishes
If you considering using a midi bass - try IK Multimedia Modo Bass, the best!
I like the sound of the guitars and the mix is o.k. But to be honest, the more important things are: Melodies, Epicness, Arrangements. You did a great job on the first two! Further improve your arrangements, more homogeneously assimilate all the different influences, include vocals and be careful not to sound to "happy" with some parts. (What I mean: Some bands (like "Skogen" - do you know of them?) manage to write great melodies AND stay dark. I like that.) Then you have it - a real masterpiece
I don't write often, when people present their music. I do here, cause I see the chance that you are able to create not only "some more music", but real ART!
All the best - have fun and keep us informed about your future ART!