You will be hitting your peak from your meal at one to two hours after eating, but it sounds like you are coming down within range by the time the novorapid has gone. To tackle this, you might want to consider injecting 15 mins before your meal rather than increasing the dose so your novorapid has a chance to get working and conincide more closely with the digestion of your food. I've started doing this lately and I do have better levels at the two hour point, but it can depend on what you are eating so you'd need to do some experimenting and testing for a while to pin it down.