@BogdanX Thank you, will try that!

Yeah I've had a problem with my Flecha rolling very slightly to the left, too. You need to leave it be for quite some time to notice it, it's very slight, but it's somewhat annoying.
I spent hours, several hours after hours after hours trying to find what was causing this issue, disassembled the whole plane, checked each part, but found nothing. I decided to just release it as it was in the end, it remains a mystery to this day.

@ENG1Fail
I just wanted to add that even though the biggest issue is with ground handling (it has been fixed though), There is still a problem where the plane rolls extremely slightly to the left once in the air. I’m not sure if you were talking about that or something else though...

@FlyingHueman @SaintNPC @Random40 @TheFantasticTyphoon Thank you very much for your help and ideas guys! I would have never thought that the wheel friction would be a problem. I´ll try to finish my build tonight (It will contain more weapons and incorporate your fixes). I would be happy to have you as Beta testers before I fully release it. I´ll post the link in this thread as soon as I´m finished. And of course you will be mentioned in my final version ;P

@ENG1Fail Seems like it has already been resolved, but I wanted to chime in on a different aspect, if I may.
First of all, it's looking mighty nice! that's one complex camouflage scheme to make in SP and I'm surprised it came out this good. I cannot think of the amount of time and patience that went into this.

With that in mind, to make the most out of your work, you want the best colors you can get, and don't get me wrong, the color you have currently is actually pretty good and it works. Now, the problem with Brazilian camouflage is that the colors change a lot depending on the lighting, even moreso than other camouflages. If you take a photo with lots of warm sunlight, it's going to look very close to what you have currently, but otherwise it has a more blue-ish tone.
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Some photographers who have seen these birds up close have described the green in the camo pattern as having a "slight purple-ish hue that's difficult to catch on camera". Having seen F-5EMs and A-29Bs up close myself, I don't know if I really agree with the "purple-ish" part but they definitely have some of slightly blue-ish look.
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This palette picture right here is probably the easy-pickable (flat colors) one which comes the closest. However, I've found in SP it looks too bright and flat.
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However, to be completely fair, the specific paint tones vary a lot depending on how worn-out the aircraft is and other factors, such as uneven painting, so don't be afraid to make it a little more green/darker than in that picture if you think it looks too flat, such as in this picture, which is also one mighty good reference for weapons. (Personally, I'd keep the centreline fuel tank and give it either two rocket launchers on the outboards + two BAFG-230s on the inboards, or two rocket launchers on the inboards and two MAA-1 Piranhas on the outboards. If you keep the wing fuel tanks, might want to angle them upwards a bit, but that's just nitpicking.) The problem here is that since it's shaded it might be harder to pick the color exactly, but it looks better IMO, could only use a touch more of blueness, and a bit more washed out for the green.
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As I said before, this is really hard to get hard and changes a lot, so don't worry too much about it. I'm just telling you this in case you find it useful, and keep up the good work!

For those following at home, the main issue seemed to be with the tire friction being too high, and potentially asymmetrical friction on the front landing gear.

I got you covered.
Very awesome design, kamarade. I hope I can get a special mention from when you publish it. :)

@ENG1Fail
I also checked for asymmetrical drag and I found some in the main landing gear, but that isn’t it. Try checking in the cockpit and even inside the wing.

@TheFantasticTyphoon I´ve checked for that but couldn´t find any major assymetrical drag indications

Asymmetrical drag? Check that.