% for melding materia is broken

[Astralos]

For example. at 99% success I've done 200 synths. My data shows I have a 95% success rate from my 200 synths so far. Even this is too small of a sample size to be statistically significant.

Well, not exactly. Most social sciences hold that 30 is the generally-accepted minimum number for a sample size, but also that as you increase sample size beyond that point, statistical significance increases in tandem. 200 is a perfectly valid sample size from which to draw conclusions.