Base damage against sunbreakers period is 189. High armor increases the amount of HP you have slightly. Not the amount of damage a sniper headshot will do. And players have around average 200 hp. 194 for minimum armor. So, even with a hunters lower armor as a sunbreaker, you cannot be sniped by the LDR archetype of snipers, which includes 1k. Thank you for having a fair and productive response.