Even if your target is in optimal range those dual 150s won't have good tracking or DPS.
Try this...
[Highs]
Heavy Electron Blaster II (Caldari Navy Antimatter)
Heavy Electron Blaster II (Caldari Navy Antimatter)
Heavy Electron Blaster II (Caldari Navy Antimatter)
Heavy Electron Blaster II (Caldari Navy Antimatter)
[empty]
[Mids]
10MN MicroWarpDrive II
Warp Disruptor II
Stasis Webbifier II
[Lows]
Damage Control Unit II
Energized Adaptive Nano Membrane II
Energized Adaptive Nano Membrane II
1600mm Rolled Tungsten Plates I
[Rigs]
Medium Ancillary Current Router I
Medium Trimark Armor Pump I
Medium Trimark Armor Pump I
[Drones]
5x Warrior II
3x Ogre II
(this is all coming from memory so I might have a few "details" of this fit wrong)
Notes: This is a variation of the normal 1600 plate Vexor (3x trimarks, small guns and/or small neuts in the highs) that I usually fly (something my corpmates came up with while they were bored). It packs a little more punch over then "standard" 1600 version however you lose out on some utility (i.e. Neuts) that might come in handy against certain ships.
The one downside with this fit is that, obviously, it's slow... so you do run the risk of being kited.
Other things to consider: You can swap out the 3x Ogres and replace them with 5x Hammerheads and 5x EC-300 drones ("just in case"

) or go for a more "ganky" fit using an 800 plate, a Magnetic Field Stabilizer, and Heavy Ion blasters.