How exactly do you plot a course on an 18k LY exploration journey ? Did you arbitrarily chooe a specific destination, if so how did you choose it ? Also, are you using scoopable stars only, or neutron stars as well ?
Before departing, I go to the galaxy map and pick a destination toward the southern rim of the galaxy. I then bookmark a star system (I just choose randomly) that is at the desired distance and heading I want to go to.
Why the southern rim? It is the closest rim from the bubble. Presently, I stick within 20,000 LY from the bubble (in future explorations I will go much farther-i.e. the eastern rim, western and northern rim, and eventually do a Beagle Point).
In the last two explorations, I picked random points around 10,000 LY from the bubble, both at the Formidine Rift. This netted me several earthlikes and numerous terraformables.
My present target system is in Kepler's Crest.
My focus is on first discoveries and searching for earthlike worlds and the other ones that yield high payouts (water worlds, terraformables, etc).
As for plotting a course, I have found that the automatic plotter tends to have difficulty plotting a 18000 LY course, so I use the waypoint system. I first bookmark the target destination and then add several waypoints between the bubble and the target destination. So, the route is broken into several sections that can be planned via the route plotter.
I only use scoopable stars. I have not yet practiced neutron jumping.
However, I am aware that it is a good idea to keep an eye on that plotter and switch to manual on occasion. On the way home from my last trip in the AspX, the plotter took me through an extensive area full of T tauri stars and plotted a course through them, with no scoopable stars along the pragrammed route. So, I had to switch to manual and carefully search for scoopables and manually trace my way out of there. These were tense moments, but finally I left the T tauri field.