DOA has bad net code in general. I'm from Asia and I still get 4to 5 bar connection strength in other games like street fighter, MK till European region but not in this game no. in addition to this, I seriously think that bringing this game on the current gen console actually screwed with this game somehow because these problems were significantly less on older consoles .i use ethernet connection all the time.
at the end of the day, I'll still say that don't expect TN to make any change in the net code at this point and ppl should just learn to deal with it(excluding the frame splitting lag obviously) but many just choose to complain instead of actually going in the lab and trying out the lag simulation . you should be prepared for lag if you're playing any FG or any competitive game online.