Don´t think that dynamic Levelranges are possible with Grinder. I Recommend you to switch over to the Quester and build yourself a profile there, this can cover a lot more conditions then the Grinder. On another node, Attackrange from 10-15 should be the Mob range, but when you are attacked by hostile mobs, he will attack them for sure, regardless the Level the Mob has.
If you insist on using the Grinder, try to rebuild your profile and grind green Mobs in Areas where only Greens or yellow are available.
