Alright, so I've recently started my transition to a full bomber. Currently I have a Mad Bomber Set, Nitronome, Shivermist Buster, and Radiant Sun Shards. I've been looking for clues as to what is my next move and I've come up with either Graviton Vortex or Dark Briar Barrage. So I'd like the better bombers expertise on this.
I know some might say something out of the Haze series, but I *REALLY* find the Haze series incredibly boring to use, whenever I'm dropping Nitronomes and Sun Shards causing mayhem I find myself enjoying the game far more than I had before, however when I'm on Shivermist duty I think I have dozed off once or twice out of sheer boredom.
I'd say right now I have the most trouble dealing with Retrodes, Greavers (bats), Gremlins, and Devilites.... MAYBE also a little of trouble with Kats.
Note: I'm not completely disregarding the haze series, but I would prefer suggestions on bombs that would help me tackle different scenarios rather than just spamming status effects.
Generally I would encourage the Graviton. But in your case I truly think that the Barrage will do you better. I'd wait for more opinions on the subject, but with the Mad Bomber Set you want bombs that can deal out damage. Furthermore, your current bomb setup won't combo all that well with the Graviton. Sure you can freeze them but you then what? Nitronome them and knock them away? Pick at them with Sun Shards?
And to compound all this, you're having trouble with monsters who are primarily weak to piercing. A fellow guild mate of mine loves the Barrage against Fiends and I think you'd find it a lot more helpful than the Graviton.