I'd avoid phasing it TBH. You want it nice and clean. I'm glad you're using massive, it's my go to synth so it'll be easier for me to explain.
I'd go to the voicing tab and turn the voices up to something crazy like maybe 8? (you may need to turn the volume down slightly within Massive) This will give it a huge, full effect sound. Then maybe on your FX tabs I'd add a tele tube distortion on FX1, but turn the dry/wet down to about 9-10 o'clock. then maybe try a chorus ensemble, or small reverb onto FX2, again turning down the dry/wet a little.
You could also add some very small ring modulation via the modulation oscillator onto one of the oscillators to help give it some dynamics. Also, in the voicing tab there are 3 sliders, turn the bottom one on (cant remember the name of it off the top of my head, pan something or other?), and slide it so it sits just to the left of the mono label in the middle, this will also help fatten the sound.
After that, it's all about how you build your FX chain outside of massive, to make the final mouldings to the sound.