Ich love Krieg, but i have problems with the flash effects from Shield of the Firehawk an Silence the Voices. My Eyes and Head, it hurts a lot.
A Pure Explosions Build with Carnage and Crunch or Reaper Class Mod. Is this Build Viable in OP8? http://bl2skills.com/psycho.html#52505515003150550105150105020000000
It looks viable but I’m not sure about the Carnage as I’ve only ever found one. A DPUH might be easier to get and also do a better job. As for the com I’d say a good (Flesh) Crunch would be great and a max explosive relic if you can find it (max is 39%). I’d also suggest a slag Bouncing Betty grenade to slag enemies when you use RtB and maybe an Explosive Fastball for boss enemies…
OP8 melee without Silence the Voices (StV) is possible but don’t expect an easy time killing enemies outside the range of regular bandits or rats as you’ll be losing quite a bit of damage per-second without the melee modifiers from StV or a Sickle class-mod — for melee, having both StV and a Sickle class mod is the optimal setup but melee-weapon hybrids still work well with StV and some other classmods than the Sickle, namely the legendary Reaper for the increased kill-skill duration on Fuel the Blood and Buzzaxe Bombardier.
About the gear, at OP8 you should forget both Punchee and Rapier, they’re much more suited to Zer0 or a raid-boss bloodsplosion chain build, for regular melee-weapon hybrid gameplay stick with the Rough Rider as it gives you the highest1 hit points, i.e., the maximum amount of damage you can take before getting downed).
The Carnage is ok I think, a bit lackluster regarding the damage output but it guarantees Bloodbath (BB) activation upon every kill. A slightly stronger option could be a Swordsplosion, trading the guaranteed BB over a higher damage per shot (assuming both direct impact and splash damage).
Some other generally good weapons you could try out: Twister, Flakker and Tattler (with some other means for activating BB, you can get even more damage on top of its already high damage).
1 You can get more hitpoints with an Evolution but it requires shield recharge to be taken into consideration, something that wouldn’t normally happen since you have points into Feed the Meat and Embrace the Pain.