I'm sorry, I have been deeply buried in code and have not followed each and every message in this discussion 100%. I makes no sense to pretend otherwise, it would just not be honest.
My FTL implementation idea is/was (basic but hopefully clear description):
Assume my DNS data from above:
FTL would check:
f7ds.liberation.frliberation.eulerian.netatc.eulerian.net
If, at least, one of these three is a bad guy, the entire query will be blocked. The check would happen, as usual, against all black- and whitelist entries (both exact and regex) as well as all gravity domains (the formally mentioned performance penalty is mostly gone as of this morning).
So you might want to highlight why you say I'd need to consider this or that special part in FTL. Maybe the discussion already went on and into deeply into something I've missed. It would be great if this could be pointed out then.