I did build local rep. Problem is the rest of e'm are swimming in missions; up to offering over 9 at a time. Sirius nearly always 0/0.
You won't like my news then:

I have been getting my 20 data missions no problem: 4 factions, offering up anywhere from 1 to 3 or 4 missions each but not always, sometime you have to sit a bit and you have to switch back and forth between solo and open play modes to get missions under both modes, though I usually run under "open" play mode, seems like fewer NPC pirates. If you are not immediately (probably won't happen) being offered the long-range delivery missions (my mission preference) when you arrive then run a few data missions back-and-forth between Ceos & Sothis and a delivery mission should show up within a run or two. Keep running data missions and more will show up and if you shop your missions carefully you can fit them exactly to your cargo capacity. If I have any small space left I fill it with Sothis Crystalline Gold and get shifting. I have even gotten single missions that exactly fit the capacity of my holds. One-stop 400+ ly deliveries, 10+ million for delivering 120 tons of biowaste. Poop never smelled so sweet. Made over 30 million last night in a couple of hours. When I deliver back in the bubble I pick up as much local rares as I can in the vicinity and run back to Sothis. I always run to Sothis
first, load up on data missions, deliveries if available (usually not) then run to Ceos. Ceos is usually good for a delivery mission or two if you go there
after Sothis. Always go to Sothis
first. This way if you do luck into a hold full of deliveries (plus data missions), you can drop off your data missions at Ceos for an extra million or two on your way out of town. Remember to shop your missions, don't take the first ones that appear, read the entire list, you can often mix & match to fill your hold exactly to cap and some missions are much more profitable than others per ton.
On another subject, Anacondas are pirate-bait on Ceos-Sothis. Switched back to my Asp-X (again). Half the # of jumps for the same distance (faster & less grindey) and it doesn't draw NPC pirate attention the way a solid-gold Anaconda does. 1/3 the cargo cap of a 'Conda but twice as fast covering space. Took out the shield generator to gain 8 more tons cargo room. And getting it blown up costs me 200,000 not 20 million. Also, the (scoop-able) stars seem better aligned for an Asp-X. With the 'Conda I was hitting 4, 5, 6 purple stars in a row and having to stop & search for fuel. In an Asp-X almost every star on its route is scoop-able. An Asp-X can get into Sothis Mining, too.