I'd like to second what
@Werbenja says about flounder bait - it's not worth it, and fishing by the ocean after Day 2 isn't either. What's worth mentioning is that Day 6 is sub-optimal for getting the bait maker in a classic CC run, as you need to trigger the cutscene sooner or later, and I fail to see the benefit of waiting with it. Day 5, after turning in the pickaxe, seems the best, provided you a) had money to buy 300 wood and 15 additional iron ore (or however much you lack, not to forget 25 for iron pickaxe Day 7) The last time you're at the beach before Day 5 is on Day 3, and if there are required forages already then you have all the reasons to hit the beach on D5, it is as simple as that and it could be added to the Guide.
River jelly seems a rather good source of energy to me. Since days 3-5 are spent fishing mostly without targeted bait, you're almost guaranteed to get +3 jellies by the end of day 5. They fetch the same as iridium quality chubs with Angler bonus (125g) but provide 10 energy more (75 compared to chubs' 65). That said, you could save some chubs for later (for unlocking the vault or early SC runs) at the price of fewer fish smokers - but only in theory. It's either Sea or Cave jelly that you'd struggle with.
Some thoughts or minor strats that may come in handy:
1) Since money on Day 2 is a bottleneck, utilising Day 1 should be done to its fullest.
a) Eating leeks and chopping down the trees is more profitable than selling the forage alone - provided you have time to fell 2 trees.
b) I'd propose a slightly different route D1: after felling 9 trees and making a chest around 8:20, leave the farm at 9:00-9:10. Try to shake all the trees on your way - after level 1 foraging, they'll have the chance to drop a seed. Search the forest and meet Jas at 11:06 when she leaves her room. Then, Leah, Haley, Sam, Penny, then to the shop: Abigail, Pierre, Marnie. Don't forget to sell forages and tree seeds. Then George and Evelyn, then Alex (should stand outside with his rugby ball) then Pam, who should be near. Then Gus and Elliot. Forage the entire beach - it should be doable after selling the forages. Then Clint and Shane. Then the bushes behind Jojamart, and try to catch Maru (going up). Then to Jodie and Catherine, go down for Emily, and while heading home catch the little boy and Harvey. It should be slightly after 3pm in comparison to 4pm from Zamiel's guide.
c) In my route, you need 1 chest in the forest and 1 by the mountain lake (I skip the chest in the mines/move the one from near the lake later) plus a scarecrow on day 7 but wood for it should be obtained on D6. This means any surplus of wood over 100 D1 could be shipped without any worry, and it'd help to hit 1800g D2.
2) As
@Werbenja said: you can skip watering the crops D2 and you will still be able to get a cauliflower just in time to unlock next bundles. This, however, is slightly risky, as it's one more day without a scarecrow.
3) I'd rather fish longer D2 than forage the beach (before 9am) and the reason's simple: getting Fiberglass rod causes snowball effect of providing more fish exp, more money, and, on rare occasions, fishing level 5, which provides 25% more money.
4) Buying 500 bait is a waste of money. You need no more than 200 from D2 morning to D5 dusk, and even this is probably an overkill. If on D5 it turns out you can't make the bait maker - just buy some more bait from Willy. My bet is 150 bait bought on D3. Additionally, saving fish from D2 makes it easier to hit 15 000 earned on D5 and enough money for the bait maker as well. Hitting 15k lets you open 2 letters, with 500g each (provided you play as a female) which helps to: get money for iron pickaxe upgrade and to save fish for smoking.
5) Sell the cheapest-per-head fish first to save as much smoke-able fish for later.
6) It might be useful exp-wise to buy a random targeted bait from Willy on D2 if it could help you get perfect catches by making consecutive hits more predictable - this way the pool of patterns is lower. This, however, was not tested and I can't assure it'd work.
7) Save the lowest quality catfish/largemouth basses/bullheads for bait maker. You can keep it in the chest (by the pool of water) for D5. I assume saving 1 is optimal if you are to struggle with meeting ends on D4, and saving more when you do not.