Ascended salvage tools (1 use) should stack. Ascended salvage kits (5 or 20 uses) should be removed from merchants and replaced with 5-20 tools in fractal loot tables. : r/Guildwars2
PSA: Use Intact Mosaic to stat change non-crafted ascended gear to crafted ones for very cheap research notes (~40c per note) : r/Guildwars2
Ascended equipment - Guild Wars 2 Wiki (GW2W)
What are you going to do with all your ascended items? - Guild Wars 2 Discussion - Guild Wars 2 Forums