Here's some notes on the 1st three devil's. Probably all I will get to
Starting with the basis of the core Patrons, this is the kind of ability granted
Archfey
Fey Presence: 1 action, 1/short
Misty Escape: 1 reaction, 1/short
Beguiling Defense: Passive, unlimited reaction
Dark Delerium: 1 action, 1/short
Fiend
Dark One's Blessing: Conditional passive activation
Dark One's Own Luck: pseudo-reaction, 1/short
Fiendish Resilience: Passive
Hurl Through Hell: 1 action, 1/long
Old One
Awakened Mind: Conditional Passive
Entropic Ward: 1 reaction, 1/short
Though Shield: Passive, unlimited reaction
Create Thrall: 1 action, 1 target at a time
Derived General Template
1: Conditional Passive or action 1/short
6: reaction
10: Passive, possible rider reaction
14. Action, long or short
I would somewhat suggest that the Patron's abilities be well suited to either Pact Weapon (more martial), or Tome (more caster), but the base Patrons aren't strictly so.
Zariel
Might Makes Right: Dark Ones Blessing++. Adv/Dis for 3 rounds is ridiculous. Perhaps if it was 1st attack roll or save within the 1st 3 rounds.
Break The Hordes: The number of Eldritch Blasts you could generate is ridiculous, even if it is only clearing peons
Infernal Legions: This should be a passive
Unbreakable: Needs to be 1/short or 1/long
Dispater
Infernal Bulwark: Appropriate as a sort of passive
Aura of Fortitude: Choice of aura benefit leads to confusion or arbitrary choice when an enemy attack lands. Should be Warlocks choice, or even only AC, given Dispaters mantra. 6th tends to be a reaction.
Hellish Warding: Double concentration is an interesting balance consideration I've had some balance discussion about... with no conclusion. The question is whether any Warlock Abjurations are concentration and last long enough for this to be action worthy. This is passive-like, so probably the right level.
Iron Flesh: This tends to be an action, and I'm not sure invulnerability even shows up in high level spells. This would be much better as something like 1/x Iron Body from 3e.
Mammon
Devil's Tongue: Seems reasonable
Goldsight: Problem is it becomes almost a guaranteed advantage againt any relevant humanoid targets at this point.
Great Temptation: This tends to be the passive slot. This also comes in sooner than typical spellcasting progression. Patrons don't tend to grant spells. The spell list or invocations are better suited.
Midas Touch: Are you intending to modify the duration to permanent? Could have it rider a shrink or hollow and give a suggested value range of CR x dX.