I can understand Dice Value (DV) being confusing. Agility +1 and +1 Agility are interchangeable i.e. they mean the same thing. A DV modification would be clearly stated, such as Agility DV+1.
So, the Blade of the Wyrm (Fight DV+1, Fight +1, Harm 4) would modify the Fight DV by +1 and a +1 bonus to Fight rolls.
Crump's Hammer (Fight +3, -1 Agility, 3 Harm) would give +3 to all Fight rolls, -1 to Agility rolls, and deals 3 Harm. There are no modification to DV.
Iron Knuckles (Deal 1 Harm on failed attacks) deals a guaranteed 1 Harm to the target when your character misses.
I'm actually working on an update for TROVES, making it simpler for players, and addressing issues like DV and modifiers. I'm aiming to have the new version out by the end of this week.