Blood glucose spikes after eating are perfectly normal and nothing to worry about in non-diabetic people. Also, during exercise, the spikes are much less strong, see for example this infographic from Asker Jeukendrup’s group.
If you’re really worried about eating too much sugar, its probably better to have it while riding, than at rest.
If I are like that, I’d be starving too. Sure, I probably exercise a lot more with a higher FTP. But man, so little food!
I think I ate that many calories so far this morning, lunch is in 10 minutes! 
You gained 8kg of belly fat eating mostly carbs, and you are hungry all the time.
In my understanding, belly fat is the sign of excess carbs that are converted by the liver into fat (i would check for fatty liver too).
I would add fat for the satiety feeling, and reduce total calorie intake until you stabilize your weight (I’m assuming you want to stabilize it)
If you want to allay your fears that you are diabetic or have insulin resistance, explain this to your doctor and ask if they would be willing to do a fasting glucose and HbA1c. Once those tests come back in normal range, you can sleep well at night that your hunger is due to calorie in < calorie out.
Sheesh, this is the 3rd thread recently about blood sugar
CGMs sure are creating a lot of panic
Don’t encourage him going to his doctor for unnecessary tests.
He’s only 29, relatively thin, and trains mid-volume. There’s little chance that he has type 2 diabetes. He doesn’t need tests. He just needs to stop diagnosing himself with the internet.
It would be very difficult to be T2 diabetic as an endurance athlete with highly functional mitochondria, low body fat, high vo2, etc.
I’m 44yo male with ~244 ftp @190 lbs and what you described as your daily intake would barely cover half what I eat in a day. Everyone is different but if you’re hungry, eat! Eat healthy and balanced just more of it 
60 g/hour is still on the low side. I’d up it to at least 90 g/hour over time. 100 g of carbs has about 400 kCal, which is likely less than half of what your body has burnt during that particular workout.
You should be very cautious when you discuss things like glycogen spikes. A while back there was a thread on constant glucose monitors for athletes, and how to interpret their data. I’m not an expert, but (1) neither are you and (2) we should not assume that glycogen spikes during heavy physical activity should be judged the same as glycogen spikes when you are sedentary. To my understanding, though, blood glucose spikes are perfectly healthy during physical exercise.
I think you are worrying about the wrong thing at this point: from the sound of it, you don’t get enough calories, i. e. you are not getting energy balance right. How you want to allocate your macros is something to think about once you get a handle on taking in enough calories.
I believe earlier in the thread a FTP in the 190-200w range was mentioned. Totally different levels of fueling required compared to you.
