First, good for you for caring and paying such close attention! I have used Humulin on and off over the years, including a couple of times in a pinch in recent years when I didn’t get my humalog Rx refilled (long story). Second, your A1C is not horrible; I consider 7.0 pretty good in most cases. Yes, it’s great if you can get it lower, but I struggle, even after dealing with this for almost 30 years.
With the meal you describe, I would actually have more trouble with the french fries than probably the regular soda. French fries are a slow-digesting food and they always cause me to peak like mad hours after I eat them (even just a few).
Is there any way you can get your endo to give you an Rx for humalog? I’m curious as to why you’re using humulin, as most endos really don’t prescribe that anymore. Granted, I think it’s a good thing to learn how to use. Humulin insulins (R and NPH) are widely available, even without a prescription in most states. Therefore, I think it’s always good that people with T1 know how to use those insulins, just in case they ever find themselves in a jam (you can get R and NPH at most Walmart’s for little cost without an Rx in most places).
One thing that helps me when I’m doing shots is to split my humalog bolus if I’m eating a meal that is very starchy or slow digesting (or just something that I know makes me spike hours later). You can give yourself half of the dose at the beginning of the meal and another half at the end. This always works well for me, especially for things like pasta or rice (my “evil” foods).
Remember with T1 that no two people are the same. The things that don’t make other people spike may make you spike. It’s A LOT of trial and error. And sometimes what worked for you in your teens doesn’t work as an adult (due to hormonal changes).
As for your grandpa — ignore him. This is NOT your fault. You are doing everything right. Just reaching out to other people with D will help you tons because we’re the ones who have dealt with the trial and error. I have learned so much from this site and others like it and you will too. There are days when I do EVERYTHING right and still have a random bizarre high. There is so much beyond our control, including hormones, the quality of the insulin we have at our disposal, weather, etc that can impact our BGs. The best thing you can do is learn through observation. Track your BGs and try to discern the patterns. DO NOT rely on your endo to do this for you because they rarely know our bodies like we do.
Have you read Think Like a Pancreas? Or Pumping Insulin? If not, read these books now. You seem smart and really motivated, and I think these books will help (they have certainly helped me!)
Finally, feel free to PM me if you have any other questions. I hope this helps and hang in there!! D can be frustrating and depressing at times, but it has also given me some fairly positive things that I’m just now beginning to appreciate