There appear to be two prevailing theories about these commodity missions:
1) They're purely random. If true then any system in any state is just as good as any other state and mode switching/relogging is a viable approach to getting a target mission to pop up.
2) They're not random, they're tied at some level to reputation, system state or economy, in that case mode switching/relogging is a potentially horrendous activity since you may be waiting forever for a very low or zero percent chance.
Personally I drift from system to system, pick one mission for something I truly need, grab any other missions that are headed the same way and jump. This means I'm constantly hitting different economies in different states. It also means I have a large growing set of systems where I'm at least cordial with the locals. I never have any issue building up an inventory of mission only commodities. I currently have 5 hoses, I've had more but I spent some and lost some when I went full metal stupid during a T7 mining incident.
So my simple advice, don't waste time refreshing, if you don't see what you want move on.
No idea if it's true, but another commander was getting the feeling that the engineer components were more common near the engineer that uses them. It might be worth checking missions in and near their system just in case he is right.
Possibly that was me, I've certainly voiced that suspicion. After spending a lot of time poking at the BGS or mineral gathering (which are similar in nature at some level) I'm fairly convinced it's not simply random, it's just sufficiently complex that it appears so because we haven't done any statistical analysis. I'd spin up some research into it but I haven't had enough need to warrant spending the time.
What we need is something like the monster with an interface where people can record the following data:
- Commodity or data type (cooling hoses, fractured fairy tale firmware etc)
- System
- Station
- Surface or Orbital
- Economy (industrial, high tech etc)
- State (boom, war, bust, famine etc)
- Faction political stance (corporate, dictator etc) since they give different mission types
- reputation (neutral, cordial etc)
What would be truly sexy would be to tie it in to something like ED Discovery or another mapping interface and see from the system names whether commodities are regional. During Beta I was half convinced they were.