What the heck is wrong?!

[Thorauku]

20% is still 20%.

[Reiryuu]

20% is still 20%.

I don't have any trouble failing once or even 2-3 times in a row. It's the 5-7 times that frustrate me and they happen quite frequently on a recipe that is 4 levels below me.

[Lysandrus]

I don't have any trouble failing once or even 2-3 times in a row. It's the 5-7 times that frustrate me and they happen quite frequently on a recipe that is 4 levels below me.

Large streaks like that are definitely frustrating, but they are statistically going to happen. Most people tend to remember bad experiences easier and with more clarity than good, so while you notice and remember those streaks of 5-7 failures, you overlook the streaks where SH2+HT works 10+ times in a row, even though it statistically should have failed twice.

After hitting 50 on three crafts, having the other five at 40+ and having all three gathering professions at 43+ (non-Legacy, so all in the current system), I'm well acquainted with the RNG and have personally not noticed anything "off" with it. If you suspect something, I recommend recording your results for a while, good and bad, and seeing how things look with a large sample.