I think Waila is horrendously broken in some areas. Granite indeed requires Tier 3, and Iridium requires Tier 4, so it takes the higher one of the two.
What WAILA fails to notice is that Blocks in world are different from the Items they drop. That Granite Ore Block has a way different Metadata than the ItemStack it will drop, and WAILA does NOT check the inworld Block Metadata for Harvest Levels, like it should, because inworld Block Metadata is literally the ONLY way to determine Harvest Level, you cant even pass Coordinates to that Function, Metadata is literally the only damn way…