230-250k p/hr for cannonballs seems really high. o_O Pretty sure it's only 150k gp/hr or so (just going to use that).
Woodcutting - Pretty sure neither Yews or Magic trees come out to be more than 150k p/hr, especially with how cheap both are currently. Wouldn't even consider Mahogany logs since there's no easy way to bank them. It's been awhile since I did them but even at 99, pretty sure Magics max 120k p/hr.
Mining - Pretty sure it gets to around Cball level once you hit 70 for addy and surpasses 150k p/hr once you get 85. Don't think it gets over like 200-250k gp/hr though. It's decent but not the best.
Fishing - Dark crabs are the best AFK money making method I'm pretty sure, assuming you have wilderness elite. I got around 300 crabs p/hr and even though dark crabs took a big drop in price, they're still around 370k gp/hr atm (depends on price but I was getting 300 p/hr consistently when I was doing it). After that I'm pretty sure Zulrah scale fishing is best though that's dependent on your cooking/fishing level. Think with 99/99 on both, you should get somewhere around 200-225k p/hr? Then I think it goes sharks with dragon harpoon, Anglerfish and monkfish are all a bit under the 150k gp/hr cannonballs are, being around like 130k or so? Hard to give exact levels, but Dark Crabs is easily the best at 99.
Cooking - Can cook around 1.2k raw fish p/hr (depends how much you're AFKing of course). Obviously depends on the prices of raw/cooked fish as well as if you're 99 cooking so you don't burn any. As for currently though, assuming you're cooking 1.2k p/hr, cooking sharks/dark crabs is around 130k gp/hr, monkfish is around 110k gp/hr, and anglers are around 80k gp/hr. This is just from a quick search and the prices aren't set since the price of food often goes up and down. Sometimes things give more gp/hr than others, just need to check the margins. For example, I just checked and it seems like karambwans have around a 250 gp margin between cooked and uncooked. o_O Unsure how long that'll last but yeah.
Maybe not worth a mention but cutting logs for fletching is decently AFK though it doesn't meet that cball level. Still another option.
Personally preferred dark crabs, although the requirements are steep. Probably one of the most AFK methods since the fishing spot never moves and always good money since the bait is always cheap and dark crabs will always hold a decent value because of how much they heal. Granted I haven't been there since the release of raids so unsure how bad pking is there now with the new weapons/prayers (seen videos where fishers got 2 specced by claws and such). However, before it wasn't too hard to escape pkers if they came.