You're right. That still makes it only 4. I remember there was a thread somewhere, where some ppl explained that if +min dmg is higher than max dmg of the avg dmg roll part, it might become absolutely hidden. Meaning you wouldn't see the number at all. Based on that, i have tried to check the amulet on your monk and its a -3351.1dps difference, but on the picture you show, its -2065.8. The exact number pops up if i modify the avg dmg to 42-53, which would mean there's a hidden +32 minD.
I'm not 100% sure about this, but it might be the explanation and would make it 5 rolls (+min +max +avg dmg +vit +dex/vit)
Dex is base Jeatch. If you count that in, it needs 6.
If dex (or any other stat on any item except cindercoat and blackthorns jousting mail) is already present, it cannot roll once more. The only way to increase dex further is from a double roll (dex+vit in this example)