I have been running a little route that took in Diso too during the "offer" in open, my type 6 has no guns but I do have good shields and a cell bank just in case, I have posted here each time I have been in open, 4 times I think in the last 2 / 3 weeks, I have even stated I had 100-200k CR of rares on the return trip that I was happy to share (sale price at Diso), I jokingly suggested I was scared & needed an escort, e.g. "come pirate me, you can have half, or all of it if you RP escort me to the station", I was in the mood for interaction that evening

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Probably been there 15-20 times in open, Friday and Saturday evenings mainly, I saw some players in SC to start with, less to none later on, I got interdicted by 1 AI & 1 CMDR, the AI was a bigger threat, I didn't hyperspace away from either, just SC and I was fine.
I assume by "manic" you mean really busy, I am in the UK and I was on after 10/11pm BST (GMT +1), what time were you on and where are you based?, it might be the UK crowd are a bit thin that time of night and the server is trying to match me with our friends in the USA.
My Speed test result is "ping 7ms, DL 20 Mbps, UL 6 Mbps" right now, I am on an AMD desktop via wifi, sometimes the DL & ping are worse but UL normally around 6Mbps.
I have seen maybe max 8/10 CMDRs in SC before but that was a while back, during the Diso excursion I think 3/4 was the most, I am still seeing CMDRs so I doubt its my setup, more likely the times, but 10/11 pm on a Friday / Saturday ain't late, well not to me.
Maybe I need to run "The Code" diagnostic, was it Lave or Leesti? I know its around there, Dammit, I still haven't been to Reidquat, I need to do that for old times sake too.