Ok I dumped my 208 tons of guardian junk, collected with an anaconda using the "belly up collector spam" method, at Delphi and got instant top 10%. Looks like very few people beside me had the idea of asking how this should be done and instead decided to do round trips with an SRV from an 8t cargo sidewinder or something.
I'm glad I didn't have to do 104 round trips with an SRV for that, but it still was more of an exercise in frustration than anything. Finding a proper approach vector to the guardian structure so that
- angle from the horizon gives the limpets highest possible chance to avoid crashing on pickup
- distance is short enough that released collector limpets immediately proceed to pick up items
- distance is not short enough to be in "danger zone"
- there are artifacts in range viable for pickup (only some have a small chance of crashing limpets)
... proved to be a royal PITA. I put myself in a spot, release 6 limpets and they collect 6 items before they all crash. Then I move 10m in some direction or change the angle by 5 degrees and suddenly I get a return of 2 items per 6 limpets.
I also decided to do the final few jumps to delphi on 100% jumponium, to avoid a couple of extra hops and reduce the chance of a goid encounter
Thanks all for the answers and suggestions!