Hey there,.. well Lami, I gotta say your tweaks definitely worked, having a positive impact on gameplay

Holy shit what a difference.
I did the -20 on all of the ability stats you mentioned, for 3 teams: Queenspark Rangers, Sevilla , and my bogey team Argentinos Juniors. The first 2 were random (haven't tried these teams yet), and Argentinos Juniors because I literally lost to them about 15 games in a row on superstar over the last week (hence stating previously how much harder Superstar seems these days). Yes, switching from FM shooting to Basic, has now made things easier for me, but still some of goals they were scoring was still almost leading to that dual-shock-rage-damage (aka DSRD) feeling. The build up passing from the cpu was just too good, and it honesty felt I couldn't do anything to defend these goals. The goals they were scoring on Superstar seemed truly defenceless. And to the point where I was questioning the current patch being changed without our knowledge... just seemed Superstar was much harder, and I didn't quite see the mistakes and the heavy touches that I saw previously after the latest patch.
Anyways, I had 3 games after the "-20 toned down stat edit" (on superstar with the same p1 teams), ensuring no live update of course, and wow... totally changed the game. If I had to sum it up in a few words, id say the power has been give back to my defenders. Much easier to defend, as they cpu was no longer overpowered in their passing and touch, ie. so many heavy touches, definitely more passing mistakes, and it was much easier to read the cpu's passing lanes which meant I made so many more intercepts (which was almost impossible prior). It just felt like both teams, me and the cpu, were on an even playing field. As much as im loving this on superstar, now im really keen to see how this affects "Legend" difficulty.. as I prefer the challenge of "Legend's" pressing defence compared to superstar (making it obviously more challenging/satisfying to score). That, coupled with a "-20 toned down stat edit" with their attacking, could really be something great...will try this out over the next few days.
Good stuff Lami