Bounty Hunter 4 (Source)

Tmoney808 wrote: do you get more investigation xp per mission if the mission difficulty is high?

There's a simple formula to calculate Inv xp

50 bounty credits earned=1 investigation xp or credits x .02 = XP

In other words, if you take a bounty mission for 5000 credits, you are awarded 100 inv xp upon completion. If you complete a bounty worth 10000 credits, you earn 200 inv xp.

So in answer to your question, yes, if you take a bounty with high mission difficulty you WILL earn more XP. However, this isn't specifically due to the mission difficulty, but rather that more difficult bounties pay more than lower difficulty missions. Just remember its the pay (which translates into XP) you are really looking for, not necessarily the difficulty.

WARNING: This does not mean you should learn Investigation I as soon as possible in order to generate the higher paying missions!!! Until you have Investigation II you will spend more time as your droids are more likely to fail when finding your mark. Therefore it's STILL best to run novice BH (Invest 0) missions until you cap at 10k Inv XP

NOTE: The more proficient you are with the weapon you have equipped when choosing the mission and the more damage that weapon deals out, the higher the pay you can generate from the terminals. In otherwords, if you have LLC 4 and pick a mission with your LLC equipped, you will generate higher paying missions (and again, remember this means more inv xp in the end) than if you equip a pistol with only BH pistol 1 (or even 4, as the LLC causes more damage than your pistol).