I'd suggest maybe cutting out the high GI foods all together. Many of us don't have issues with blood sugars, but get that drowsy feeling after eating certain foods or too much.
If you're seeing negative effects and you can pinpoint which foods, there is no reason to continue eating your triggers.
Many people find that their cravings for very starchy foods are greatly reduced once they cut them out of their diet 100%, and it can also help with hunger.
If you're interested, a group of us
use volumetric ways (high volume, low calorie density) to have huge, filling meals and still lose weight.