I FOUND IT! 3420 is the Perception you want for your MIN/BTN retainers!

[Roth_Trailfinder]

6.4 is annoying.

Anyone know what Perception is needed for 50/8’s for level 90 items? 4072 Perception is insufficient for 50 Raw Star Quartz, or 8 of anything Ilmenite and lower on the list.

EDIT :

Ok, just took one of my Mining Retainers and MAXED Perception out. Got to 4235 Perception. Not everything required pentamelding, but everything that took it got it. Body, Hands, Legs, Feet, and right side accessories could meld to max Perception. MH, OH, Head could not reach the item’s Perception cap even with all 5 melds used.

Level 90 Raw Stone Quartz maxes out at 50/hour.
Level 90 Stoneheard Water, Lunar Adamantite Ore, Rhodium Sand, Rime Dolomite, Raw Eblan Danburite max out at 9/hr.
Level 90 Ilmenite, Raw Rutilated Quartz, Ash Diatomite cap out at 7/hr. I suspect that these would also hit 8/hr then 9/hr if there was enough Perception available to do so.