I'm back again!
Firstly, a typo I noticed (sorry, I pick up on such things

) - the information you put in says 60,000 CR goes from grade 1 0% to grade 2 0%, ought to say grade 2 20%.
Second, I have further information about hunting for Todd's bounties, may it help CMDRs who come after:
1. To give folks an idea of how common these bounties are(n't):
Relative amounts (rough estimates) of bounties after mostly zooming around the Nav Beacon for a full evening & night:
900k Alliance
1350k total from the Wolf 397 minor factions
120k Empire
82k Federation
75k Todd
2. From Grade 2 19% (somehow it went from 20% the other day to 19%, don't ask me why/how), handing in those 75,000cr worth of Todd bounties got me up to Grade 2 77%.
I am beginning to think it *may* be faster to make cheap "sturdy" upgrades to a multicannon, as it only requires 1 Vanadium + 1 Nickel, both extremely commonly found while vacuuming planet surfaces in a SRV (in my experience, at least).
I have at least 25 of both right now in my inventory, so I'll try this when I play next and post here again with my findings.
Some additional advice & tidbits:
- A "kill warrant scanner" is required (practically speaking, given the spawn rate; I didn't get any Todd bounties til using one, and it could actually be required for all we know)
- NPC affiliation does not matter (I haven't tried scanning many "clean" NPCs for bounties, so no idea if they're available that way - only tried a few, didn't find any myself)
- None of the NPCs in the CZ carry any bounties (look, I didn't know til I went and saw myself)
- USS's can often spawn "wanted" NPCs, and I did get some of my Todd bounties through this method, though doubtful it's at an increased rate compared to the Nav Beacon
- Interdicting "wanted' NPCs in the system from supercruise yielded around 5000 cr's worth of Todd Bounties when I gave it few tries. Spawns are slower than in Nav Beacon, but seemed to me like a higher proportion of "wanted" ships. Remember that interdiction range is tied to your ship's current supercruise speed, so you can get away with as little as a 1E interdictor - the 2A was more than plenty for my FAS. Most of the trouble is just getting behind the target.
- This is anecdotal, but boosting around 10-15km away from the Nav Beacon, then flying back, seemed to "reset" the NPCs and make the old ones jump out and new ones start jumping in; not doing this can often mean waiting around for 5-15 minutes without seeing much change
If you're
crazy, you could try purposefully carrying a few tons of "valuable" cargo and taking advantage of the current AI's psychopathic-piracy behavior to get Wanted NPCs to come to you rather than the other way around. But I'm not crazy enough to actually try this myself.
Additionally, there are some settlements on the same planet as Todd's base that could be attacked and might have "wanted" turrets or Skimmers (the Cartel's settlement seems a likely bet) - but I've never done a base assault before, and doing a flyby of the station got me a warning & nothing appeared that my ship that I could target (and being a combat loadout on my FAS, I was reluctant to go outfitting and get a SRV bay installed).
Still I'd figure it's possible Todd bounties could be found this way? If some patient investigator is willing to try, let us know, eh?
TL/DR: Collecting Todd's Bounties are a pain, the info above might help you, using cheap & easy-to-find commodities to make modifications might be faster, good luck!