You can have MUCH better control using both a very fast acting analog insulin, which in the USA would be Humalog, Novolog or Apidra (names may vary in your country) with a long acting insulin such as Basaglar, Lantus, Toujeo, Levemir, or Tresiba will definitely help. If analog insulins aren’t available in your area it gets harder, since human insulin, known here as Humulin or Novolin (R or N of either) takes longer to be effective and lasts longer than the last meal, so you would tend to go high soon after eating, then go low shortly before the next meal. Those insulins need to be taken 30 to 45 minutes before the meal, and may require a snack in between meals.
The other thing I notice is that you are eating very high carbs. For instance 50 grams of carb for breakfast is a large problem, since it requires so much insulin to balance it… and ANY irregularity in exactly how much you’ve eaten, since many times food will be as much as 10% more or less grams of carb believed to be in it will change your results tremendously. Eating lower carbs makes control so much simpler.
Also taking pre-mixed insulins such as 70/30 is always risky, since the shot you take for breakfast is affecting you into the afternoon. It sounds like you go somewhat lower in the afternoon as a result. Taking a larger dose of JUST rapid acting insulin, with a lower amount of long acting insulin before breakfast should improve your results, as well as lower carbs reducing ALL insulin levels, as above.70/30 locks you into a system of frustration, rather than good treatment of this affliction we share here.
61 years of Type 1 and doing well