About the new Sublime collectables for Aetherial Reduction into Glioaether

[Jojoya]

My Indagator's gathering gear is pentamelded to Gathering 4118, Perception 3996 before food, with HQ Jhinga Curry (Gathering 4254 & 909 GP). That's good for 19% Sublime chance (with food).
I don't think that we'll get much more than 20% chance until we get new gathering gear in a future update. 20-21% is going to probably be the max sublime % chance for now.

If I feel froggy, I'll craft and penta-meld a max gathering set (with perception added only after gathering is maxxed) and see what that % gives, my guess is it won't be more than 22'ish %.
Feel free to send over your spare Gatherer's Guerdon Materia X & IX, in the name of science. :-)

Indagator is as good as it will get for Endwalker. There will be no other crafting/gathering sets this expansion beyond the Augmented Perfectionist scrip gear that will get added in 6.4 if SE follows their usual system and that will only match HQ indagator without pentamelds.

You may want to wait until 6.4 before playing with a new set of gathering melds since we'll probably be getting a new set of Sublime items then.