Thanks for the tips! I've been close to looking for some since my runs mostly fizzle out at ante 5 or 6 at the latest in a really unsatisfying and often frustrating way, a surprising number of times less than a thousand off the target.
I'd figured some of these over time but a few of these are good to know with your longer term experience. I haven't relied too much on adding cards to my deck since I feel like that's a fairly inconsistent way to go about things, but maybe I don't have faith that my run will last long enough to give me time to put together a better deck lol. So I typically invest heavily in two pair hands and sometimes flushes, and otherwise make small tweaks around the jokers I happen to get. I'll try the approach of tailoring a deck to 4 of a kind hands over time, that sounds interesting. Ironically I've gotten far more straights than 4 of a kind hands, but I think your argument makes a lot of sense. Good notes on card enhancements as well.
I had similar feelings lol. I was introduced to Balatro by a friend who streamed himself playing it over Discord, and he said, "Oh you'll love this game, you like poker and rogue-likes (which is true) so you'll love this." My first comment within 20 seconds was, "this isn't really poker at all, is it" but it was still really intriguing so I picked it up on GMG and don't regret it.