Ah, I misunderstood. The brew technique itself is sort of rough, not necessarily my technique?
I've tried a few different procedures (starting with boiling water in the base versus room temperature; with or without aeropress filter) and have managed to achieve what looks just like what various coffee youtubers describe as ideal, with a slow and steady flow with "creama" and no sputtering. I think the high acidity comes down to too fast extraction, so I'll try to experiment and see if I can adjust that a little.