It really is personal. Even different foods can do this for me! For example, I know for a sandwich I need to pre-bolus earlier (about 20-25 minutes, instead of my usual 10 -15). However for a pizza, this does not work. Instead, I need to do my normal 10 minutes pre-bolus, but at only 50% of the ratio, and then I need to take the other 50% at 45 minutes after I have finished eating. Each person is different, and even each food is different (makes our lives so easy to manage, doesn't it? Sigh).
I'd suggest maybe keeping a food diary for a week or two - write down what you eat, and the carb count etc - make a note of your pre-bolus times, test 2 hours after each meal, and see if there is a pattern with certain foods. It may be that there is no pattern, and each foods are different, but it would at least give you a starting point, and evidence, to discuss with your medical team, who would then hopefully be able to advise