The guides I read back when I played on live all said that tradeskills use the highest value out of the relevant stats and wis/int were always relevant to all tradeskills. Thus, a character with high strength (fighter, rogue, etc.) should buff their strength when blacksmithing, but a cleric should buff their wisdom for the same task.
I have a 2005 guide (it talks about the Feir'Dal Fletching Kit just being added) which outright states that skill-ups in fletching are governed by the highest of int, wis and dex. Maybe this was not true of 1999, but it makes sense that dex always governed fletching.
TL;DR - the highest of int/wis/dex probably decides if you gain skill, so wis only helps if it's higher than your dex.
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Mentathiel Rogue and haunter of level-inappropriate dungeons
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