Thank you, yes, it worked on my second attempt now. Are there any more free offers to test this out (not begging, but if there is, I'd love to look at a couple of transactions)?
I sent you 2 simple checks in pm, but
AMLBot's prices are acceptable for everyone

Another question, is there a way to use the service to look at a set of txs and auto compare for similar fingreprint/pattern/behaviour as a way of marking them as part of the same cluster?
That's one of the clusterisation approaches. In fact, there are even several clustering methodologies.
Here is a very fresh article about clustering
https://arxiv.org/abs/2005.14440Also, what's your false positive rate at the moment?
IMHO, there is no such thing as a false markered address. It's even opposite, AML databases need some time to follow the blockchain in real-time, so there is a slight delay (one-two hours) between "real activity" and risk score rate.
Also, the results of AML checks may change through time, due to constant blockchain activity.
Would be glad to answer more questions)