Recent experiments have led to continued improvements in the hybrid Electric Oxygen- Iodine Laser (ElectricOIL) system that significantly increased the discharge performance, supersonic cavity gain, and laser power output. Experimental investigations of radiofrequency discharges in O2/He/NO mixtures in the pressure range of 10-50 Torr and power range of 0.1-2.0 kW have shown that O2(a1Δ) production is a strong function of geometry, pressure and diluent ratio. The goal of these investigations was maximization of both the yield and flow rate (power flux) of O 2(a1 Δ) in order to produce favorable conditions for subsequent gain and lasing in our ElectricOIL system. Numerous measurements of O2(a1 Δ), oxygen atoms, and discharge excited states are made to characterize the discharge. Results with both molecular iodine injection and partially pre-dissociated iodine are presented. A gain of 0.17% cm-1 was measured with a corresponding outcoupled power of 12.3 W. Modeling with the BLAZE-IV model is in good agreement with data.