Personally Im not a fan of dual coils at the lower voltages. They are alittle better on a 3.7V PV compared to a 3.3-3.4V eGo, but their still nothing special at all. They dont heat up well and they produce a pretty cool vape bc the lower voltages just dont put out enough power to run them well. Dual coils are much better when used in the 4-5V range.
I use an E-power which is 3.7V and the tank I use is the Smoktech 3.5ml XL tank. Its cheap and it works great. It does come with a 1.5ohm dual coil in it, but like I said I dont like them so I just took that carto out and never used it. I use a 1.7ohm Ressurector carto in the tank instead and it works a LOT better. You can punch your own or CCV sells pre-punched Ressurectors for the Smoktech
tanks. They even have the metal base on them like the carto that comes with the tank does. You dont have to use a carto with the metal base, but they are nice bc the metal base stops the tank from being able to slide down. If your using the Omega at 3.7V I would def try using the Ressurectors in a tank, I think youll like them alot more than any dual coil.