Blazing Gauntlets are definitely a worn ATK buff. I wish they were a clicky, because that would be awesome, but it is not the case.
Here is a list of items with worn effects.
https://www.project1999.com/forums/s...untlets+effect. I found this by searching the forums for "blazing gauntlets effect".
One possible reason you're not seeing a flat 14 ATK increase in the character screen is that the values the character screen shows for ATK and AC are not entirely accurate. They're weird wonky averages that are based on your stats, level, class, and whatever other bonuses you may have.
Another possible reason is that Firefist does not stack with Grim Aura (or Strength of Nature, or the monk epic effect Celestial Tranquility).
http://wiki.project1999.com/Firefist If you've got Grim Aura on, Firefist will do nothing.