One issue I've noted with XP gained and leveling is on Tarkus. It seems I'll gain enough XP to get to level 8 (max), or at least high 7, just from roaming around trying to find enough of those sexbots to first enable the quest to start and then to scan to locate the hidden spot to finish that mission. Usually by the time I get those done I'm about maxed out. I'm usually into 3rd level to finish the first planet, and then gain all the rest on Tarkus.
I don't know if it's possible to increase the likelihood of encountering them in an area, like from the entrance to the right or whatever, or if the chance of encounter can increase once you get the quest to scan them, but that certainly might help the high-speed of leveling and make the next planet a place to earn some XP rather than just only do quests for no leveling.
I don't know if it's possible to increase the likelihood of encountering them in an area, like from the entrance to the right or whatever, or if the chance of encounter can increase once you get the quest to scan them, but that certainly might help the high-speed of leveling and make the next planet a place to earn some XP rather than just only do quests for no leveling.