I am now stupidly consistent at the first waterfall. Still can't perfect past the second one, but everything else in the stage I have down.
By the second you mean the post-momiji barrage right? That's pretty damn difficult yeah so expect some serious trouble there. If you want to make it easier on yourself you should stall Momiji until she's got 12 seconds left and then finish her off. That means there won't be much waterfall left.
UFO Hard - Gotten to Byakuren without continuing
SA Hard - Gotten to Orin without continuing
Also I play TD because its extra stage is always sitting on my conscience.
That's not that bad. Your progress with UFO is close to that of Chirpy's. You can beat him to it eh? I'm sure the game must be hard on you but that is also likely the only way you are going to see some serious improvement. So go for that Hard clear eh?
As for SA, I'm surprised you haven't beaten that one already. If you can get to Byakuren then it should be a non-issue for you to clear SA Hard, especially with that ridiculous bomb-stock you get. Unless you are actually trying to clear the game without spamming bombs which I would highly approve of.

TD. Extra? Ask yourself: Do you think this game is fun? If the answer is no then it doesn't matter if you have cleared it or not. No reason to play it. It's not like there is some rule that says that you need to clear everything. Just look at me and MS lunatic, anything before LLS and PoFV Extra.