Just FYI : These mods do not work dynamically, they set predefined values as the game loads.   For example, you cannot use the 50% mod and then the -5 mod as a combo.  You might expect (0.5x - 5) but the last mod loaded will reset the values of the first mod.  Usually you only pick one.  However, the roleplay mods only effect a single perk or a group of seven perks so you can combo it with one of the big ones.  Just be sure to load the mods in correct order.

* Nerd note : To avoid any future conflicts, I use a minimum value for all these mods. All first Perk ranks are left out of this mod.  (Technically, you must gain level 2 to put the first point into any perk)  All second Perk ranks have a minimum of level 3.  (Because you have to gain level 3 to have a second point to put into that same perk)  Third Perk ranks are minimum level 4, etc.  The desired effect is achieved without creating potential problems with the code.  Why?  Because I predict that there could be game code conflicts if a level requirement is set to 0 or 1 but the game expects a non-zero or unique value.

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Percent Reduction : The percent reduction has a drastic effect on the game.  Some would say that it makes the game too easy.  The required level does become negligible with the 0 - 25% versions but the 75% feels more like a tweak.

Flat Reduction : These are more like tweaks to the game.  They move your endgame build closer and unlock the midgame very early.  You can rush straight to midgame perk ranks at levels 3-12 but you would be sacrificing basic perks.

Percent Vs. Flat : I would estimate the power level of the 75% version is somewhere between the -15 and -20 versions.

Linear Ranks : This mod leaves the highest and lowest rank unchanged and increases the required levels of the middle ranks.  The result is a linear progression instead of a curve. (e.g. Vanilla Rifleman Ranks are 0 / 9 / 18 / 31 / 46 -- Linear Rifleman Ranks are 0 / 12 / 23 / 35 / 46)

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Cannibal, Ghoul : Drops the required level of Cannibal or Ghoulish to 0%.  Can be used with any other mod, as long as it is loaded last.

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Military Classes (5)
- - - Main Skills : 25% - Secondary : 50% - Tertiary : 75%

[[Power Armor]]
- - - Main Skills : Heavy Gunner, Steady Aim
. . . . . . Secondary : Pain Train, Strong Back
. . . . . . Tertiary .: Armorer, Rooted, Toughness

[[Infantry]]
- - - Main Skills : Commando, Moving Target
. . . . . . Secondary : Action Boy/Girl, Basher
. . . . . . Tertiary .: Demolition Extra, Gun Nut, Toughness

[[Sniper]]
- - - Main Skills : Rifleman, Ninja
. . . . . . Secondary : Sneak, Sniper
. . . . . . Tertiary .: Lone Wanderer, Mister Sandman, Night Person

[[Engineer]]
- - - Main Skills : Armorer, Gun Nut
. . . . . . Secondary : Blacksmith, Locksmith
. . . . . . Tertiary .: Hacker, Science!, Scrapper

[[Medic]]
- - - Main Skills : Inspirational, Medic
. . . . . . Secondary : Gunslinger, Lifegiver
. . . . . . Tertiary .: Better Criticals, Chemist, Strong Back

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Professional Classes (4)
- - - Main Skills : 25% - Secondary : 50% - Tertiary : 75%

[[Lawyer]] "Nobody likes you, but they do what you tell them. Jerk."
- - - Main Skills : Cap Collector, Intimidation
. . . . . . Secondary : Local Leader, Mysterious Stranger
. . . . . . Tertiary .: Lady Killer/Black Widow, Lone Wanderer, Pickpocket

[[Doctor]]
- - - Main Skills : Chemist, Medic
. . . . . . Secondary : Lifegiver, Party Boy/Girl
. . . . . . Tertiary .: Caps Collector, Chem Resistant, Nerd Rage!

[[Robot Technician]]
- - - Main Skills : Hacker, Robotics Expert
. . . . . . Secondary : Armorer, Scrapper
. . . . . . Tertiary .: Blacksmith, Gun Nut, Science!

[[Nuclear Physicist]]
- - - Main Skills : Nerd Rage!, Nuclear Physicist
. . . . . . Secondary : Science!, Scrapper
. . . . . . Tertiary .: Hacker, Lead Belly, Rad Resistant

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Misc Classes (3)
- - - Main Skills : 25% - Secondary : 50% - Tertiary : 75%

[[Wild Child]] "The crit build. Get lit and go all Neo."
- - - Main Skills : Idiot Savant, Party Boy/Girl
. . . . . . Secondary : Gun Fu, Lady Killer/Black Widow
. . . . . . Tertiary .: Critical Banker, Four Leaf Clover, Gunslinger

[[Cat Burglar]]
- - - Main Skills : Locksmith, Sneak
. . . . . . Secondary : Aquaboy/Aquagirl, Night Person
. . . . . . Tertiary .: Fortune Finder, Hacker, Pickpocket

[[Black Belt]]
- - - Main Skills : Iron Fist, Toughness
. . . . . . Secondary : Big Leagues, Blitz
. . . . . . Tertiary .: Action Boy/Girl, Lifegiver, Moving Target