Yep if youve got the right doffs you can get lots of crits on dip missions greatly increasing the exp gained. If you find some good missions and get good crits you can average atleast 10k exp a day or every 2. If possible best to focus on 1 catagory at a time, atleast in my experiance.
After 2 months i had all but recruitment and trade to Tier 4. And i only logged in once or twice a day just to set up missions mostly 8-20h ones. Clusters can have some good colony missions that give decent dip exp, critting on them can net you 1-2k exp for single mission.