Little issue that I have noticed when it calculates a route from different starting location..
Using this setup and exporting the json into the required location :
https://s.orbis.zone/7lvw
I've plotted a course from those starting locations : Diaguandri - Sol - Deciat, All of them being within at most 200Ly from each other. Sol being technically the closest to the destination. Orientation is taken from being in the bubble and looking toward the center of the galaxy.
Destination : Traikoa FL-P E5-4 (about >5k LY out)
Using Diaguandri it plots toward the lower left of the galaxy : 67 jumps, 2 hours.
Using Sol it plots toward the same'ish location as Diaguandri : 63 jumps, 2 hours.
Using Deciat it plots toward Jackson's Lighthouse on the opposite side of the bubble : 155 jumps, 5 hours.
Now for the sake of testing this against the in-game plotting system, those are the results I got from the locations listed just above.
Again I'm using the build listed above on coriolis minus 3-4% on some missing engineering being maxed out, for instance the FSD being just off 1% from being maxed G5.
The plot course is using Fastest Routes and jet-cone. ~60.20LY (63.90) LY as listed on the Cartographics. All the filters/settings in-game other than Fastest Routes and Jet-cone are unchanged and all set to default.
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However when using the Galaxy Plotter these are the results I get.
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So yeah.. You get my idea..On a side note.. Yes it does say using the Galaxy Plotter a shorter / less jump intensive route... but it also gives you a 155 jumps route from Deciat that is technically 2 jumps away from Diaguandri using that Asp X setup.
Anyway I was thinking this could help you troubleshoot why it decided to just out of the blue give a twice as long route from Deciat compared to Sol or Diaguandri.
Good continuation on your project!