Just do 15 per session but give out rewards to players that do exceptionally well. Like if they role play a conversation really well, or they really put in the effort to engage the story - just hand out little micro-XP bonuses.
My D&D GM has been doing this for years, and I feel like it's a really great way to encourage the players to stay focused or do things that are really interesting. The only problem he has is he'll say something like, "That's awesome... 5XP." Except in D&D... 5 XP is really quite useless even at level 1.
But in EotE - if you just dish out 1XP here and there... well... that 1XP can actually add up pretty quickly. You can potentially do a lot with only 5XP. Of course later on, you might consider bumping it up to maybe 2 or 3 bonus XP, but you get my point.
Edited by Raice