Carbohydrate counting and Mid afternoon high glucose

Type 1 diabetes - 23 years, I have recently done the CHO counting course. Also new to these forums.

My Blood sugars after lunch seems to require much more insulin than in the morning time.
The CP ratio appears to be around 2.5 to 3 at lunch, but 2.0 in the morning and 1.5 at evening meals.
Is such a fluctuation normal?

Also exercise at 8am dramatically reduces insulin required at lunch (12-30pm), but morning insulin and food remain virtually unaffected ( I may need to take 1unit or 2 before exercise)- so a lag in response to exercise early in the day.

Exercise == 30 mins eliptical cross trainer - fairly rigorous.

If I Exercise at evening meal , my body seems to react almost immediately to the exercise, and I lower insulin requirements by 6units then. Blood sugar seems to regulate immediately after eating at 6pm and 30 min training at 6-30pm.

My blood sugars are steady overnight and in the morning. Its the afternoon fluctuation that can be complicated.

Are these fairly normal traits?

Thanks for the quick response!
I take the basal insulin at 11pm normally. 32 units of lantis.
So is this a feasible reason?

Im puzzled by the issue. Some more information:
If I lie in at the weekend , the afternoon sugar rise is far worse, and conversely If I train in the morning, the issue is more or less eradicated. So activity in the morning is almost necessary!
The time when the sugar appears to rise is at 13-14 hours after the basal dose (between 12-30pm and 2-30pm). Its directly after lunch. Sugars can absolutely rocket into the 20s very quickly after lunch, and correction doses are very high - 2units per 1mmol.
And I feel between 20-24 hours things are stable again, that is, if sugar levels are good at 6pm, they'll be fine at 11pm.
Very frustrating!