After carby meal , why 3 hours later is my blood pretty much optimal ?

Grumpy Porridge said:

And 2 hours after dinner , it’s now 4.8 ( I’m guessing I’ll have a hypo later if I don’t eat something now , so will have something

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So it sounds like you slightly overestimated the carbs in your dinner?

Have your team explained to you how to carb count and do correction doses?
They should have given your two numbers
1) carb ratio , number of g of carbs for 1 unit of insulin - you divide the total number of carbs in your meal by this carb ratio. So eg if you're on 10g of carbs per unit of insulin, and you ate 60g of carbs, you'd have 6 units of bolus.
2) correction ratio, how munch does 1 unit of insulin bring down your bg levels.

Your basal is meant to keep you level when you don't eat (eg overnight), then if you do a blood test before you eat you'll take enough bolus for the carbs in the meal, plus a correction dose if your level before the meal was too high.

As you leave the honeymoon period, you'll find your ratios and your basal needs change, so don't be surprised if your team change the numbers.

It's nice to see that you're starting to calculate your doses, though I'm afraid I don't know what all your food items are and so can't comment on the actual calculation.

But the whole point of calculating insulin doses as a T1 is that if you get the dosing right, you can eat a carby meal and have a perfectly normal blood sugar afterwards. It's not like T2s who can't use their insulin to process carbs properly, you just need extra insulin because your body doesn't produce much (eventually any) in the first place.

Good luck with the carb counting and insulin calculating.