A recent 18.6 patch adjusted XP up on Rubika and down on Shadowlands ... which is fine.
What I recently noticed is that the mission rewards for Rubika missions, at least at lower levels, are now out of line with the Rubika XP.
A level 18 toon pulling a mission at level receives 583 XP to kill a mob in the mission and only 1130 for the mission reward. I can't say for sure, but it seems like mission rewards used to be more than the XP of two mob kills.
Maybe my memory is faulty, but it still may be worth adjusting the mission rewards a bit.
Emma
166 of your XP were allocated to your personal research.
You received 417 xp.
New Level: 19!
27 xp was gained as a side bonus!
You can loot these remains.
Received reward: 1130 XP, 1898 credits.