Save your money and get a good unit. Sounds like you’re serious. The problem is your budget. Unfortunately, better units simply won’t likely fall to within your budget at this point in time. The mevo+ looks promising but the stickers would be a deal breaker for me. My set up is a gc2, computer with FR1 (with all courses), country club elite mat, projector, and hitting screen. I’m sure I’ve left something out. The only problems I have with the gc2 is the fact that it over-rewards low spin shots (like driver) on the carry distance. Otherwise, it’s very accurate. Really the only data points I care about are ball speed and start line; I don’t curve the ball too much generally. If my ball speed and start line are where I want it, I’m pretty happy. Other potential issue I see for it moving forward: it does not have a LED flash like the quad so those have to be replaced after a while (long time but still). That said my foresight guy gets me what I need and has taken care of me.
The Ping G410 Plus sits open at address. My suggestion is to take your grip and hold it straight in front of you with the club face is square, then address the ball. Your push should then become a draw.
Erik already told you what you need to do from a technical standpoint.
I think you're trying too hard and you're getting emotional while you're playing. I can tell from your post. Emotions can help you focus in some sports, but in golf they will absolutely punish you. If you let your emotions get the better of you, they will reinforce the negative and ignore the positive while you are playing. And once that starts you might as well pack it in for the round.
You and I have been playing about the same length of time. I'm a 90s golfer. I don't know if I'll ever break into the 80s consistently. It's a goal, but the world won't end if I don't. You've put more time and effort into this than I have. The biggest lesson I learned was to play the game one shot at a time. Forget the last shot that you hit. It's gone. It's not there anymore. You have an entirely new situation in front of you. Look it over, figure out how to best play it, pull the club, go through your pre-shot routine, relax, visualize the successful shot, trust yourself, and swing the club.
"What happens if I hit a bad shot?" you say. Laugh if you have to. You're not playing for a $ millions. The shot is gone. You have a new shot. It's the only way to deal with it without getting negative thoughts. Play within your game. Don't try to do what your game doesn't allow you too do.
You also said "an easy 6i shot". Now I don't know if you meant to take an easy swing with the 6i or it was a simple 6i shot. English is vague. If you meant the latter, you assigned a value to the shot. It's just a 6i shot. You either make it or you don't. Saying it's 'easy' and missing it means failure. Having it just be a shot and missing the green means you just missed the green. You have to chip or pitch on. No value to the shot. A former tour pro gave me this advice. And I'll mention, this is one of the most difficult things to do, but it can keep your head clear of negative thoughts through a round. That's all I have to say about this. YMMV.