Oh boy... tough situation. As you purchased the cart “used” it could be used to death, could have some other issues as well. Here is where things get tough... you need an even playing field. If you don’t know the exact history of the cart, start there. New cart. Maybe a Sumiko or others. Don’t spend a ton (yet). Then, get your cart and arm dialed in. If you don’t know how, and don’t want to learn then have someone do it for you. I agree with the others, your issues are most likely setup/settings related.
The thing with digital is it’s easy, brainless, and effortless. Absolutely subjective which is “better” simply because there are too many variables. I will say, vinyl, when done right, is sublime. Period.