With your weapons, I don't really see the point. The goal of Vortex is to clump mobs together so you can charge an aoe attack in the pack. Since both your guns don't have any aoe, there is no real point (i don't count ricochets as aoe because they are finite).

They are good if you play in a party and people charge in it, but only when reaching at least 4*. The 5* version is really great (although it could use a walking speed buff).

Not that much if you are solo because DA and faust charge is too long to be used before the vortex detonate, and when doing the full combo in the vortex, you are going to be hit more often than not. The best combo is with Brandish lines, which have a very short charge time, useful status, and an aoe charge, if you go for combo. Or Voltaic Tempest, because shocked clumped mobs = ultra carnage (tho you'll need a good finisher).

a vortex bomb is good for alchemer line guns cause their charge attack basically reach full potential when fired at a packed mob

iv seen the amount of destruction a vortex can do when combined with alchemer charge attack and its pretty impressive
polaris is also good for firing into that pack

As a group, it works nicely with alchemers. My mate fires firo drivers into my vortex'd mobs while I just spam the vortex and teh fire/status spreads nicely while letting the ricochet spam do it's job, not having to worry about stopping to switch to bombs.

But as a solo it kinda sounds like too much work and a lot of quick reactions, while still relying on potential screw-ups.

For gun/bombs I'd probably get a status gun, and/or polaris, a high damage gun and fast dps bombs; thinkin' DBB, RSS etc.

OR!
BETTER YET!
You could twist it around and use somethin' like shiver+polaris, or VT+firotech. Let the haze bombs linger around status's and kite them through it while firing complimenting status' at them with guns. That sounds like fun! :D