As you posted many hours ago I'm assuming that the goł±bki are well and truly cooked by now! I learned how to make them from my Polish husband (and he's first generation Polish, grew up in Poland). I've never heard of them being baked in the oven. I always make them on the stove top which is how his family make them. Don't know if it varies from region to region.
Here's my method. I cook the cabbage first, boil the whole thing in a huge pot. You only want to parboil it to soften the leaves as they need to be firm enough to handle without breaking. Then let it cool and separate the leaves.
I make the filling with mince (pork is more authentic than beef but I sometimes use a mixture of beef and pork, beef for the flavour and pork for the fatty element which adds additional flavour and moistness) cooked rice (again you should only parboil it, it should still have a bit of bite), grated onion and a little seasoning. I use black pepper and a tiny bit of cayenne and sometimes bind the mixture with an egg. Although I use lots of garlic in cooking, I never use it in goł±bki and the 'real' Polish recipes I've seen (not Polish American!) don't always have garlic so I'd say it's not an essential part of the dish and is up to personal taste. I would also never use Worcestershire sauce as it's absolutey not traditional in a Polish dish. It's an English sauce with a very distinctive flavour.
Regarding the sauce, it's generally fairly thin and I make my mine quite watery because my husband prefers a thin soup consistency for it. I make the sauce with two tins of whole plum tomatoes which I mash, then add quite a good dollop of tomato puree and about two litres of water. And yes the pot sould be absoutely stuffed with them, barely room to put on the lid. You can put a plate on top to weigh them down during the cooking process.
I layer the goł±bki in the pot and then pour over the sauce which I've already brought to the boil. Then I simmer it on the lowest heat for an hour or two.
Anyway that's how I do it, hope yours worked out ok. Smacznego!