Thank you Quarmat and others for the feedback. I knew a forum like this would have some sharp-eared people. (I used Reaper again).
Haiduk isn't 100% black metal. Vocals & tuning are death-leaning, and some songs are death-thrash (Songs 6 & 7). I like that people struggle to label Haiduk. Like this metal youtuber spends a minute trying to describe it, before settling on "unique style" and "blackened thrash".
https://youtu.be/92D-xTIT4Lk?t=911
Vocals I had difficulties with recording & equipment. Tried to fix them in the mix later with limited success. Looking back, I should have used EQ to get rid of some of the low end more. (I am also a novice on mixing, @reark, but still prefer to do it myself).
Not sure why the Bathory reference, other than they also had a raw / DIY mix. Of course they as a touring band build up their stripes the traditional way which is harder and people respect that more. As a solo project (I do perform live sometimes but I don't tour) I have taken a different path, one that wasn't possible back then.
@Kov, I needed to keep the overall sound / distortion a bit cleaner since I play lots of fast, busy riffs. I love tons of distortion but it buries my riffs. (Bass I had a difficult time mixing as well, so it was turned way down).
@gullum, I tried all kinds of panning configs, and this was the best way to create the particular atmosphere I was going for - like 'blended' guitar layers. Panning too far apart killed the effect.