Hellgate Mechanics

Being a stats freak, I had been very curious about the mechanics of partying in Hellgate.

So far from this post, it seems as if the level difference between party members does not affect the experience in any way. Only the player level vs. Monster level is checked.

So Monster A is level 2 and gives 10 exp.
Player 1 is lvl 2
Player 2 is lvl 2
Player 3 is lvl 45

Not in group:
P1 solo kill A -> P1 gets 10 exp
P2 solo kill A -> P2 gets 10 exp
P3 solo kill A -> P3 gets 0 exp (level too high)

P1 and P2 are now in a group:
P1 kill A -> P1 gets 20 exp, P2 gets 10 exp
P2 kill A -> P1 gets 10 exp, P2 gets 20 exp

P1 and P3 are now in a group:
P1 kill A -> P1 gets 20 exp, P3 gets 0 exp
P3 kill A -> P1 gets 10 exp, P3 gets 0 exp

P1, P2, P3 are now in a group:
Extrapolating exp?:
P1 kill A -> P1 gets 30 exp, P2 gets 10 exp, P3 gets 0 exp
P2 kill A -> P1 gets 10 exp, P2 gets 30 exp, P3 gets 0 exp
P3 kill A -> P1 gets 10 exp, P2 gets 10 exp, P3 gets 0 exp

Now, I am interested in doing some testing as to if the party member actually needs to be in the zone for these changes to occur or simply being in the party will do. If this is the case, then just partying with people even while soloing will yield greater exp than just soloing. Of course monsters will have more hp and take slightly longer to kill.

Also, a more indepth look into the augmenatrix is featured here.
So in order to try to get the mods listed, you have to pay for that level of the mod

White Mod -> Pay for Normal Mod
Blue Mod -> Pay for Rare Mod
Orange Mod -> Pay for Legendary Mod