Level (75-90) 140,000 every 8-12 minutes

[PostBot]

Note. You must have completed the Avatar Destroy mission(worth approx 300kXP about an hour to solo, get a guild imo) to be able to take this mission.

Using this map by rodav:


You can repeat Mission #4. It's worth about 140kXP and 10k credits each run. Once you get it down, you can run through the 5 WP's without needing to fire a single shot. Everytime you incap, wait until the weakened state has gone away and then continue. This ensures that you don't have to restart the run.
At level 85, it takes me 9 minutes per run, including space time. For every level below that, add approximatly 1:30