Well, sneaking a peak at Only War, the most similar power there would be:
Prerequisites: Psyniscience Rank 1
Focus Power: Difficult (–10) Perception Test
Description: The psyker’s awareness of the Warp grants him the means to elude his opponents’ attacks without needing to rely on mortal reflexes. He
walks through the battlefield unscathed, dodging incoming fire with a simple ease. In any situation where the psyker would be called upon to make an Evasion Test, he may instead attempt to use this power. If the power is successful, the psyker avoids the attack exactly as if he has passed an Evasion Test.
Of course, the focusing rules are completely different, but this basically lets the Psyker use his preferred stats, boosted by his Psy Rating, to Dodge, instead of relying on Agility and the Dodge skill.
But I'm not convinced. I think the problem is that many DH Minor Powers are VERY useful. But as Psykers in DH don't get discipline powers until rank 3 or so, it's kinda necessary that they be.
But I think perhaps a minor power resulting on -30 to all attacks is a bit much. Perhaps distort vision needs further nerfing. -10 or -20 perhaps.
And Precog Dodge could use a boots, and I don't see why it shouldn't help against melee opponents.