A few thoughts reading this thread.
First and most importantly, set up your machine however you have most fun. It’s stupid to set up your own machine in a way you think is right based on someone else’s opinion, especially given the cost and space requirements of these things. Fun for some people will be getting frustrated, for others that’s not fun.
I think that's the most important thing. I would be bored rigid if I owned Cactus Canyon and Elvira, set up with 10 balls. I'd just walk off mid-game. When we owned LoTR, I actually got frustrated playing games where I was neither achieving anything nor draining, and drained the ball on purpose. Other people love the longer more relaxed games, and that's great too. The best way to improve is to play regularly and, if you're not having fun, you're not going to do that
Do I still post my high scores occasionally even though my tilt is loose, my outlane posts are on the bottom, extra balls are on and ball saves on wizard modes are increased? (if I get there I want to enjoy the mode) Yeah, because it’s my high score, I’ve beaten my best and I’m happy about it, it’s not to compare to other people and say I’m better than them.
I think that's fair. I always make it clear that I'm posting high scores in a specific context

The OP was asking about competitive play, and that could mean posting high scores (which is having fun with your machine) or it could mean tournament play - which is a bit different (and there are multiple people who can give much better advice than me because they're actually good - I'm just passing on advice I've received

). The OP also seemed worried about which game settings it was okay to post a high score with, and the answer is 'whenever you feel like it' and 'whichever settings you feel like'.
Anyone can beat anyone in a one off.
I've put in a huge effort into improving, so it would be nice if
@David_Vi's response wasn't he must have been playing s**t in Classics (or, at least, that's what it sounded like - tone is hard on the internet)
I'm not judging I just don't think it's relevant because everyone has their own issues, hence I didn't add anything about my back issues, mental health etc.
I think you'll find most pinball people have a variety of health ailments, you just don't hear about them because most people play pinball to escape and have fun. Pinball is the only thing I can do that distracts my crazy brain for a few minutes at a time.
I have a specific issue where I'm recurrently so ill that I can walk up to a row of pins and literally drain in seconds on every one. It must do a number on my reaction times, or something. I personally find it frustrating and distressing, because I'm a naturally intense competitive person, and it wrecks my enjoyment. I've had evenings/games where I've felt I was wasting my time at PBR because literally no game was happening on anything. I had a period of going home in those situations and leaving
@MadMonzer at PBR, and we discussed whether I should give up competitive play entirely because I can fluctuate 100+ points week-to-week in Best Game between the times when I'm sick and not, and it means I'm not competitive in a league format.
We've been talking a lot about how to fix that issue, so I've been systematically practicing doing walk-up single games on my own machines day-in-day-out, whether I'm sick or not, and I've just gone the first month where I've played every day - regardless of how ill I am (although my average scores halve). Hopefully, over time, I can work out how to get into a situation where my scores can hold up reasonably throughout the month. It's not that I expect to be the best player ever (this isn't reasonable), but it would be nice if I couldn't literally write on a calendar when my scores are likely to halve, and I'd like to see some improvement over time.