Evernus is just fancy excel. This guy still has to be online and changing his orders by hand.
Since it looks like he is not producing the stuff he is selling, you only hurt yourself by making bigger price adjustments. Because he probably got it as loot for free or from a extreme cheap buyorder someone was too dumb to acknoledge before clicking sell. So you will not hurt him with that stuff.
He is doing that while not actively pvping. Its his part time job if he has nothing better to do. I do it the same way. And my pvp changed from outer station into the station. And with your post here, he just got another kill mail. Plus hatemail and salt. Win/Win/Win/Win for him. So… its still Eve, harden the F up or die quietly and give me your stuff.
I´m in a good mood today. Here are stuff that might work.
-Stop selling the stuff he is selling. T2… yeah thats loot from pvp most probably. So he gets it for free. No contest for you there.
-Battle his orders if you wont read and listen. Create multiple orders instead of one to sell your stuff. Only a couple items at first. Refresh that items every couple seconds. He underbeats your order. Underbeat him seconds later. Do that. Again, again, again. At some point one of you will end as market killmail. Its up to you again.
-Since he is not producing, he can undercut you badly. Your choice.
-Post orders when he is offline.
-Buy your stuff from him for 30% discount. He has less stress and you might get 10% margin when you put it into market again.