The ignore option isn't there because you have Slave Hipno Perk. I don't think there is a way to change difficulty. If you want to get rid of the Slave Perk, complete Kotone's test:
Complete the questions of the First Trial, resist the temptation of the Second Trial, beat Aiko and Beat the Commanders on hard.
With these you complete Kotone's Test and give you the option of get ride of the Slave Perk. If you want the perk again just do hipno sessions.