Things will hopefully get better once they implement a new rewards system, yes the current one is pretty awful atm.
For now, I recommend getting in a TAC. As healer or even just a Palos set up for offense but keeping the auto-beams you can rack up massive points every match quite easily. The highest scores I've ever seen came from a losing team's healer. If you can play a TAC even remotely, you're guaranteed the best way to farm in this game, under the current system.
It gets boring, but right now there aren't a lot of options til they fix things. The T2 trick, running a TAC, they're all band-aids for the moment, but it's something for now.