http://forum.square-enix.com/ffxiv/t...t-second-meld.
Anyways, played around today a bit more with various materias calculating success rates.
It is evident that each meld beyond the first one gets much harder. While most people are speculating on Tier IVs atm, I find some very interesting things involving the stacked/success rate of Maxed out Tier IIIs. Assuming HQ patch coming in 1.20, or even just use a +1/2 HQ atm, there is an edge that max out Tier IIIs have over Tier IVs in the third particular attachment.
Atm the success rate of NQ Tier IV, as elaborated in the previous posts, is around 17% > 7%. However, the success rare of Tier IIIs on NQ is around 22.5% > 12%. If we take into account of using HQ base item, that number would've gotten a little higher -- say -- around 15%, which is at double the success rate of an aforementioned Tier IV meld.
This is interesting giving that maxed out Tier IVs are nearly impossible to find and at the ridiculous ongoing prices that they are at, while maxed Tier IIIs are still relatively easy to find and obtain. When comparing a 2-slot T4 with a 3-slot T3, it is evident that the T3 will have more stats available and have more versatile options.
Let me know what you guys think.