That Firebreak should be replaced with a Plate Shield or an Owlite ASAP. (Takes less priority than bombing weapons if you have good kiting ability, though. More required as you reach T3)

Sidearms: I'd consider a utility shadow weapon for solo RJP/JK runs, and maybe a polaris to help ease combat against turret spawns. (My take.)

The Bombs themselves:

Damage:

You chose blast line. Great choice. Go for Nitronome for the knockback and pure kiting and demolition power. NEVER take into groups, the flashbang will annoy everyone, and the knockback will get you kicked.

You chose the shard line. Excellent Choice: Go for the Sun Shard Line, DO NOT go for the Ionized line. The RSS line will give you extreme firepower against undead and fiends, much like that of an Argent Peacemaker. Later on, you will find fighting undead almost hilarious, and 1 shard bomb behind a Trolljan will make it spew rainbows everywhere and die rather quickly.

What you missed: Dark Briar Barrage:
Similar tactically to the Nitronome, but with a darker blast and lack of knockback, this weapon proves party friendly while giving the same damage as a Nitronome to Pierce neutral enemies, and bonus damage against pierce weak enemies.

Vortex Lines:

The Graviton: Fairly simple to obtain. Provides decent shadow damage and gives you great breathing room. Be careful about its slowdown. Also know that its clumping effect makes it spectacular in party play, allowing DA and Brandish guys to charge up and annihilate the vortexed enemies.
NEVER let you or an ally get clumped in the center of a vortex, the carnage will be devastating.

The Electron: Same tactics as above. There is a bonus of shock, and as an elemental damage weapon with actual ability to target kat ghosts, this weapon proves decent for undead killing. Shock itself is rather useful for movement lockdown and DoT.
(PvP award, hard to obtain easily at first)

The Haze Bomb Lines:

General Tactics: With the possible exception of the Ash of Agni Line, none of these bombs are particularly well designed for direct combat. All of these lines are created to provide statuses that can and will be useful in the long run.

Shivermist Buster: Freeze in general is useful as an enemy that can't move is fairly helpless. This haze bomb totally locks down movement, and in party play, can be rather useful. Damage wise, this is one of the weakest bombs you can utilize, but in terms of field stabilization and crow control, you have alot covered. Almost somewhat a requirement for killing Vanaduke. (Interrupts charges and keeps him nice and still to combat against).

Ash of Agni: Fire will never lockdown movement, and will interrupt freeze. This is in some essence, a damage bomb. Kite and spam it, and you can usually ignite waves of enemies for decent damage. Be careful around oilers.

Venom Veiler: Avoid soloing with the Toxic Lines. Posion provides a way to deal damage by enemy healing (I healed you to death!), while also being useful in the fact that it debuffs offensive and defensive capabilities of enemies. Swordsmen love huge numbers, this weapon facilitates that. Also extremely useful in RJP, where spamming poison on the Royal Jelly will leave it without the ability to absorb Royal Mini Jellies, giving it the starve effect without needing to kill everything in the room.

Stagger Storm: Not common, and kinda dangerous to be honest. Stun is glitchy and can cause double hits and stuff of the like. Provides a well made movement and ASI slowdown, however. Knockback actually applies to stunned enemies. (Unlike frozen or shocked enemies). (PvP award, semi-hard to obtain)

Voltaic Tempest: Its a grind to get this line. Be ready to face the Roaramulus Twins one too many times or pay up a large sum of money to obtain this weapon. Shock in general is a very useful status, however, locking down movement and providing damage; this bomb is the middle ground of an Ash of Agni and a Shivermist Buster. Shock itself is considered elemental to some degree, and thus provides decent bonus damage to undead and construct. (Especially if they clumped up, for shock is an AoE status). Voltaic Tempest also serves a huge use in Lockdown, where a Recon/Guardian can spam away the line and annoy foes with damage and slowdown effects.

That's my personal take on the lines, others can come and accept/refute my points.

sorry, I worded that wrong haha.

(I didn't sleep till 4 AM yesterday and got up at 6... My brain is dying.)

But yea, listen to DarkBrady on the whole blast bomb thing... Sorry for that misinformation....