Just for fun armchair design, throw whatever potency you think would make things balanced among all the jobs within their roles.
Melee DPS
Monk
-Dragon Kick potency reduced from 320 to 310
-True Strike potency increased from 300 to 310.
Reduces the power of the memekick rotation and slightly reduces Monk's Perfect balance burst. Loses maybe 90 potency every 2 minutes. Other melee will catch up once people gear out of skillspeed.
Reaper
-Communio potency increased from 1000 to 1100.
Reaper really doesn't need much help despite doomsaying. Gains about 300 potency every 2 minutes
Physical Ranged
Dancer
-Fountain, Cascade, Bladeshower, Windmill, Fan Dance I, Saber Dance potency increased by 10. (includes enhanced versions)
-Standard step potency increased from 720 to 800
-Tillana potency increased from 360 to 400
All around buffs meant to help close the huge gap between ranged and melee. Potency buffs are around 880ish every 2 minutes(including Dancer self buff)
Bard
-Burst shot, Refulgent arrow Ladon's Bite, Shadow Bite potency increased by 10.
-Caustic Bite, Storm Bite, Iron Jaws initial hit potency increased by 50.
-Apex arrow max increased from 500 to 600.
-Blast Arrow potency increased from 600 to 700.
More all around buffs meant to close the gap between ranged and melee. Slightly more impact than Dancer buffs to help equalize them at around 970ish every 2 minutes.
Machinist
-Clean Shot, Slug Shot, Split Shot, Scattergun potency increased by 10.
-Flamethrower potency increased to 90.
-Drill, Air Anchor, Chain Saw potency increased from 580 to 600.
-Wildfire Potency per charge reduced from 220 to 180 and now detonates after 5 attacks. Wildfire is now a guaranteed critical direct hit.
-At level 70, gain Blast Charge, a 1 second cast time 1.5 second recast 360 potency attack that does 75% falloff aoe damage and reduces the cooldown of Ricochet and Gauss round by 15 seconds. Can only be cast during Hypercharge and immediately ends the effect. Can move while casting. Potency increases to 480 at level 84.
A significantly higher buff than the other two that adds more flair to Machinist Hypercharge. This is almost a 1500+ potency buff within the first 2 minutes without taking into account the scaling buff to Wildfire.
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Caster Ranged
Black Mage
-Fire III and Blizzard III potency increased from 260 to 290.
-Thunder I/III initial hit potency increased from 30/50 to 80/100. Thunder II/IV initial potency increased from 50 to 80.
These are actually pretty significant buffs that help BLM at low levels and closes the gap between the average BLM at high levels and ones that find every way to circumvent casting Fire/Blizzard III. Worth around maybe 500+ potency when factoring in Astral/Umbral modifiers.
Summoner
-Elemental Mastery moved to level 72 from level 86
-Energy Drain cooldown reduced from 60 to 40 seconds at level 86
-Summon Ifrit/Garuda/Titan II potency increased from 700 to 800
Absolutely massive buff that gives Summoner 1400 potency every 2 minutes. Energy Drain at 40 seconds still lines up with the 2nd Bahamut phase at 2 minutes.
Red Mage
-Potency of all spells and Reprise increased by 20.
-Potency of combo increased from 220-290-470-580-680-750 to 250-320-500-630-730-800.
-Reprise no longer costs mana.
-Reprise grants Spellforce stacks at level 80. Scorch and Resolution consume a stack of Spellforce to increase potency by 40 and generate an additional 3 Black and White mana
Another massive buff that gives about 1450 potency every 2 minutes along with a mobility buff with the Reprise change.
Tanks
Warrior
Fell Cleave (NOT inner Chaos) potency increased from 460 to 480.
Upheaval potency increased from 360 to 370.
Primal Rend Potency increased from 700 to 800.
200 potency buff every two minutes on an auto crits and about 260 from non-auto crit.
Paladin
-Fast Blade, Riot Blade, Goring Blade, Rage of Halone, Atonement potency increased by 10.
-Spirits Within/Expiation/Circle of Scorn now deal unaspected damage.
-Expiation potency increased from 340 to 450
-Circle of Scorn potency increased from 100 to 150. DoT potency increased from 30 to 40.
This is around a total of 570 potency buff over 2 minutes.
Most jobs retain their relative positions but the current massive 8-10% dps gap gets squashed to to 4-5%. RDM, SMN and MCH would move in front of DNC and BRD. Tank dps difference would also get squashed to be around 1.5-3% at the high end. The end goal being that dps checks should be negligible if everyone is playing correctly rather than being based on meta.