The crazy differences in RNG are so ludicrously out of scope that calling it engineering is insulting to the profession.
I think alternative names Tinkerers and Magicians have been suggested.... it may be something like this:
SCENE 1
Engineer: Hi! How may I help you?
Customer: Hi! I would like to buy a level 5 tuning for my FSD?
E: I don't sell tunings. I give them for free -- but only if I like you.
C: Oh... Is there something you would like me to do for you. I'm all ears.
E: Well, I buy exploration data. That's my thing. Please, bring data, much data.
C: Excellent. I'll go and get data, much data for you.
C: <Leaves. Honks like a mad man. Scans like a crazy.>
SCENE 2
C: <Returns after many long tiring hours.>
C: Here's the data. They are all from nearby systems because I didn't want to wander too far with my current FSD.
E: All data is good, near or far. I'm very happy with this data. This is my thing.
C: That's very good to hear. What about the level 5 FSD tuning?
E: Yeah that. Just bring me Arsenic, Chemical Manipulators and Datamined Wake Exceptions.
C: Excellent. I'll go now and buy them and be right back.
E: No no no. First of all, no one in the whole galaxy sells these things. Second, you have to find them by yourself, personally.
C: Really? Why don't they sell? And why do I have to find them personally?
E: About selling, I don't know. But finding is important -- it grinds you in a good way. It shapes a man out of you.
C: Grinding sounds a bit painful. But I'll give it a go.
C: <Leaves. Lands somewhere. Drives. Scans. Fires. Scans. Fires. Drives himself crazy with Arsenic.>
SCENE 3
C: <Returns after many very long tiring hours.>
C: Hi! I finally have all the data and materials. I really didn't know that Arsenic is that rare.
E: It is only rare if you think it is rare. Rarity is in your mind. As is grinding.
C: That sounds deep. But I may be too tired to understand it now. Anyway, could you please do the tuning?
E: Sure, just follow me.
C: <Follows Engineer and sees something interesting.>
C: That's a roulette wheel! Do you have a casino here too?
E: No. That table was for special effects, but I don't do weapons anymore.
C: <Doesn't understand anything that was just said. Continues following the engineer.>
E: Here we are. We have removed your FSD for tuning. Pretty, isn't it? Are you ready for the tuning?
C: Sure. Definitely.
E: Ok, then I'll start the incantation.
C: Wait! An incantation? I'm no engineer, but aren't you supposed to optimize the frame shift harmonics or something?
E: No, the drive is already manufactured to very tight tolerances. There's no way to improve it that way. So I'll do the incantation.
C: Wow, I'm fairly confused by now, but please do what you must do. I really need that jump range.
E: <Starts calling forces of stars and planets to unite inside the drive core.>
C: <Stares, a bit scared.>
E: <Throws powdered materials upon the FSD and howls in a loud voice.>
C: <Stares, eyes wide open.>
E/C: <...>
E: I'm sorry. You got some bad luck. Well, at least it is better than a level 3 FSD.
C: Eh...
E: Bring me some more Arsenic and we will try again. Remember, grinding is just in you mind.