you have to edit the settings in the profile. right click the .xml profile that you have been loading, and click open with ... then choose notepad
there should be a
where u.Distance < 20 && u.IsDead && u.CanLoot && !Blacklist.Contains(u)
change the distance to 30 or 35.
where u.Distance < 30 && u.IsDead && u.CanLoot && !Blacklist.Contains(u)
where u.Distance < 35 && u.IsDead && u.CanLoot && !Blacklist.Contains(u)
and your pull radius to something equal to or below what you pick
i know for melee my guy loots 100% and i think that is because he is within the base range for looting. i know with casters if you are high enough level you can one hit things, but with a loot radius of 20, you can sometimes be too far away to be able to loot them. i haven't tested this myself, so i can't promise that it will work.
also note:
if you want to remove the blue text that pops up every time you loot a monster
change
log("[LootItAll] Setting {0} as lootable", target.Name);
into
//log("[LootItAll] Setting {0} as lootable", target.Name);