im fitting deimos a few months now and im telling you.....deimos with 5 t2 ions and only 2 mfs has a lot better dps then 5x t2 neuts with 3 mfs's(around 100)......try this and youll see....this will give you a much more freedom to fullfill your med/lows....
Here's the rundown now that i have Eve-Fit tool. (Why didnt someone recommend me to this earlier?!?!?)
My neutron II deimos fit : Resists EM/TH/KIN/EXPLO : 66/72.4/86.2/65.6
DPS : 601.8 From guns, 128.8 drones, 731 total
Effective tank : 121 armor/sec with 20,303 effective HP
Your proposed Ion II fit : Resists EM/TH/KIN/EXPLO : 73.5/78.7/89.4/72.8
DPS : 515 From guns, 128.8 drones, 644 total dps
Effective tank : 153 armor/sec with 22,925 effective hp
I used EANM II / Explo II / DC II / 2x MFS II on the lows of the deimos...as that's how i would logically fit it. I also used a CCC and Hybrid collision accel for the 2nd rig. I used void M for the ammo and Hammer II's for the drones. As you can see the Neutron deimos still puts out 80-100 more dps...alot more dps for the tank sacrificed between the 2 fits.