What is the best way to report the exploration value of terraformable candidates?. In my current trip I scanned near 4 thousand of them and counting (maybe 5-6k when I get to the bubble) and that may help to your findings.
Is there any way to check the value in the current logs or will screenshots be the only way?. All my data is uploaded to EDDN, so the only thing missing are the actual pay values.
I am willing to spend a couple of weeks for this task if needed (or until my patience runs out). Let's hope I make it back alive
In the current Journal only the full payout of a system or page sold to UC is logged, so no, there's (sadly!) no way to get the relevant per-body payout data from the logs - only from the UC sell-interface.
As for 'the best way': I think there are several, depending on how you like to work. With those impressive figures you've got there you might indeed be looking at a few weeks.
Anyway, here's how I proceed:
1) Take a screenshot (only of area where body-names and payouts are shown) of every system with a body worth more than x credits (I think I set my threshold for about 50k)
2) Run an OCR program over all those screenshots and transform the output (system name and payout) into a spreadsheet
3) Enrich that spreadsheet with body info/details, either from an EDD export (easy) or from an EDSM export (not so easy)
The other way that I've read is to:
1) Create a spreadsheet based on an EDD export (3 from above), filtered by TC=true
2) Browse the systems while selling to UC and look into any system above x credits (maybe 70k for full system); I would suggest taking screenshots too, just in case of typos or other mistakes
3) If you find a valuable body, search spreadsheet (best by the XX-X part) and enter the payout data into it
Optional for both approaches

4) Take the formulae from this thread and calculate the expected full payout and flag any body not getting the full payout
5) Wreck your brain while trying to find an explanation