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So is there any way to make it IDPA legal with lighter guide rod and lighter grips?

I won't name it but as a matter of fact, some shooters using a new better gun are doing better, some shooters using a new gun (worse) are doing worse. Maybe a bigfoot won't have any issue swapping from a CZ to a Glock (due to recoil management) but most shooters will find differences. There may be a lot of details which matter. Few drills are not enough to judge. I can see there's a big difference between a SP01 and a Shadow2. It's not a matter of practice.

When one gun for production is more accurate, double taps faster and easier, has a better "magwell" and a light/good trigger, swapping from that one to another will make a clear difference. It's easily noticeable in a lot of matches where you see good shooters performing better or worse depending on the gun. For example, a new gun was released and some top shooters were performing a lot worse, no matter the effort they put in, since the differences were too clear.

Is there a difference in terms of performance or anything like that between Hi-tek and powder coating?

"You can see it of course but it looks the same. " -> So it's clear that it's an aftermarket bushing but it's similar, right? Seems like it might take some work, but that doesn't seem to be hard

The only thing to check is the bushing itself, right? Is it IDPA legal since it's not a modification out of the gun? I might consider picking one for my SP01 since I noticed it's not as accurate as my S2

Is it the same as the factory bushing? It seems like there's no difference except for tolerances

I found an interesting discussion on IPSC global village where Grauffel says he uses target focus with front sight + fiber optic (using the fiber as a dot). Same does Ben Stoeger at the moment, target focus. 2 Champions confirming it is interesting enough

What's the best way to have the least reset possible? Is a stock disconnector good enough to start with?

Too much flare leading to swaging the bullet is caused by using the Lee Roll crimp die (seater + crimp in 1 stage), right? To avoid that at the moment, I must set up the the die so there's less flare. I am considering a new press so I can use Seater + Taper in different stages. Would the Lee expander die be good enough? I got a Lyman expander (not the M die I guess, I didn't buy it, I got it from spare parts) but it doesn't seem to push farther

Actually the one who told me is not even selling anything, he's a mechanic and told me it's clearly obvious that pressures will be higher (as much as accuracy). My question at this point is "how much"? He of course think it's much more (maybe 20% more? I don't know) My easiest way is not to tell him I'm going to try 500 .357. He told me I shouldn't even use 100.

@YonderingI've just ordered some .357 (500) and will try them. No issues asking them, I've been asked why but nothing more. And after I talked to another manifacturer, a big discussion about larger diameters started. Since things here move pretty fast due to social media, I guess, if it does give benefit, it will become more used in few months already. BTW: I've been told again that shooting 357 with a good alloy is bad for the gun, since it will make the gun break much faster. No need to shoot 357 when the lead alloy is hard enough. I don't know how much pressure can become an issue at that point.

If you mean the math, yes I do and it does help, especially if there are differences like HF 4 or HF 8, totally two different ways of shooting it. HF 4 > More accurate (4 points per second), take more time to aim HF 8 > Less accurate, take more risks in terms of splits, shooting while moving, and similar stuff. This would work even better in Major Champions do that math

I'd like to know that I'm talking about stock 2 only, not other Tanfoglio's. It may be a big difference

One has a cone-fit barrel, the other one has nothing. So I would believe the difference. Rests apart, I've never heard the opposite. I've hear more than once that more accuracy was achieved with Tanfoglio Stock 2, so I'm curious. With shadow2 I've read that it's more about luck with the bushing.