Dark Retribution is perhaps the most powerful single-target weapon in the game that doesn't rhyme with "Spits Wheedle". You could do incredibly efficient damage bombing to any enemy in the game using only DR and DBB.

If the thing you hate the most is knokcback, then the shock from Shocking Salt will prevent a lot of Shard bombs' trademark erratic knockback. As a bonus, the damage won't be completely negligable against at least slimes. I see you're using Volcanic Demo, and while that is an excellent choice for a support bomber, I just find my damage to be very lacking unless I at least have Very High damage going for me. You could be using a couple of damage trinkets and the sprite perk for bomb damage to max it all out anyway, of course.

I'm not sure I would recommend Sun Shards at this point in time. You already have DBB and it will do much more damage faster under most circumstances, and most certainly easier. While people can appreciate stun being thrown around, they'll mostly be mad at you for the bomb's erratic knockback. Then again, this knockback can be cancelled out if you pair it up with VT or Shivermist. If you do something like that, you suddenly have a group of shocked and stunned enemies, and those are very rarely able to do anything at all. It's a combo I use sometimes. Plant two shards for every VT and you can keep a thing going.

You don't really need an Electron Vortex. If you don't wanna play LD, you can simply get a Graviton Vortex and pair it up with Voltaic Tempest. VT's shock will affect every enemy in the vortex and work much more effectively than EV's shock would do alone. As a bonus, GV has a bit more damage and is great for gremlins.

I at least, appreciate at least Voltaic Tempest and Ash of Agni in most places. You might want to consider completing your hazebomb set with Venom Veiler. It's often looked down on for being ineffective, but that is an outdated view coloured by people who do nothing but play Firestorm Citadel all the time. Every single arena you're in, there's a chance of gremlin menders, and whenever there are gremlin menders, Venom Veiler will make everything easier.