"This machine seems like a drain monster. pretty frustrated right now, to the point where it's not much fun to play."
Pre-Covid we (Riverside Game Lab) were doing about $250/week on Stranger Things Pro. It's been our top money maker of 21 pins since the day we put it in. Beats JP, JJP WW, DP, SW, IM and others. It also has the shortest ball times and shortest game times.
With that said.... If you want longer ball times adjust your outlane post (close them for home play), extend ball save time, switch to 5 ball games, adjust your tilt, increase extra balls. When you get a little better remove some adjustments and slowly make it harder.
At home make it fun but challenging. On location make it fun and an earner.
Lastly, once Covid shut down the arcade I brought ST Pro home to my private arcade. The only adjustment I made was the outlane post (and dialed it in with loop shots going to flippers, etc. but that's different topic).