Either I suck at search function, or this question was not asked before, and I'm a bit puzzled as to why.
Looking through the list of alloys you have the following optimal skills:
Iron- 425 by itsef
Iron-520
Nickle-650
Nickle-735
Cobalt-875
Platinum-935
Mithril-1075
Then you get:
Mithril 1600
Adamantium 1600
Huh? Why am I needing an outrageous skill to process mithril, an ore I've been processing for my last 20+ levels? IG I got the answers of,
"It's supposed to start out like that because all other T6 reqs (stone) is 1600."
No, Mithril is T5. It should not take T6 skill to process. Especially not when looking at the semi-pattern of the other alloys.
"Well it's T6, it's just supposed to be difficult"
That's an answer I can just accept as is, moreso than the other answer oddly enough. "It's supposed to be difficult". Seems odd to me though, that at the very optimal currently, these bars are 2:2 using a T5 metal.