Look, the topic is about worst node, an opinion topic essentially.
Observed odds, real odds etc etc doesn't matter. Confirmation bias doesn't even factor in with an opinion, there isn't OBJECTIVELY a worst node as there's no disclosed odds.
You say it's 1-3, how do know? Do you even know if it's the same across all the nodes? is there a sample size you're woring from, compiled a spreadsheet across every single node in the game? If you have, go outside after showing me your findings. For all you know there could be a slight variance in the probability, the much vaunted math(s) you speak of could be out or it's changed since you were farming her if you did.
I have the worst drop rate on this particular node, therefore in my opinion it IS the worst node for the rate of return on energy investment. Now move onto say the Scimitar node in fleet battles, I could get Scimitar shards (quite often do in fact) OR I could get ability mats which I have hundreds of or the much prized MK V stun gun. I often get one of those thrown in too.
Sabine's node is terrible as it's the very first DS node and has nothing else on offer if you don't get the shard. Thereby it's been the worst node for me.
Calling me an ignorant buffoon because your advanced probability class was better than mine won't change my opinion. Lies, damned lies and statistics.
The above wasn't a declaration of war BTW. I've just had a long day ripping into people for not doing their jobs properly, my favourite part of my job in fact. I bring my work home with me sometimes.
/rant
P.S. I saw my first TIE Advanced slot in fleet store for the first time in 3 weeks today too. I'm half tempted to open a fleet store chicanery topic.