Multiple "new game+"

[ShadowSFX]

Hi everyone! I'm new here (and to RPG Maker). Ever since i saw RPG Maker MV in steam's store and i got the software i've been reading, watching tutorials and testing in proyects and i think i got the grasp on it (with exception for some very in-depth things like scripting myself.)

I would like to know if someone can help me out with one feature i seriously want; Multiple "New game+"

I found a script that lets you do a "New game+" in youtube (link) and lets you carry on with your level, stats, items, gold, etc. which is what i want! HOWEVER! besides the fact that you can get other things in different "runs" of the game, i want to change the difficulty itself. 

Yanfly's engine core plugin solves one of the main issues; stats limitations. However i have absolutely no idea how to implement a more "complex" formula for the monster's stats so i can increase the difficulty.

What i want to achieve is something like this, for example:

Current system:

Bat:

hp: 35

atk: 10

def: 5

New game+ system: 

Bat:

hp: 35 + (CurrentRunCount * Math.Floor(35 * 0.5))

atk: 10 + (CurrentRunCount * Math.Floor(10 * 0.45))

def: 5 + (CurrentRunCount * Math.Floor(5 * 0.40))

CurrentRunCount should start at 0 which is normal new game, and with each new game+, increase by 1. This number should also be displayed. How can i accomplish that? I appreciate any help! ><