For starters DD is already capped I think the cap is 80%? but I have not encountered a player that is too hard to kill because of their weapon DD, more because of their PVP damage drop from opaniel armor set and titles and the max PA badge etc. Also on the subject of balance and invenom there is a patch coming out probably close to winter time which should bring more balance changes idk if invenom is on the chopping block there.
Isen doesnt have walter medal? I seem to remember getting them from hunting bonus boxes and maybe event boxes too. O:
Also with the new gearing system chakras blablabla I dont think +18 is as hard of a requirement as it used to be. If you got chakras +12 you will be strong enough to kill a +18er. At the end of the day it all comes down to teamwork in this game.