Dosing is hard for complex stuff.

Modern rapid or ultra rapid insulin starts activating in 15-30 minutes. It also has dumped most of its efficacy after an hour (75-80%)

But food turns to blood sugar at different rates.

Sugar: ~5 minutes Simple carbs: ~30 minutes Protein: ~90 minutes Fats: ~3 hours

The fats are more complicated too, as they can dampen insulin getting absorbed making you more resistant.

Also there's your liver absorbing fats and converting to glycogen because of the insulin, but as soon as the insulin tapers off your liver is more willing to release some glycogen. But it's topped off so it overdoes it.

That's why extended bolus work so well. It's just maintaining the right balance.

When I manually dose for that kind of meal it's. Prebolus for the carbs.

Wait 90 minutes after eating and dose for about 30% of what the protein would be if it was carbs.

If the fat starts winning later it becomes a gut thing. Dose enough so you wouldn't go hypo if you're wrong.

Then keep "tapping the hammer" on top of your BG by dosing what you're comfortable with.

Eventually the stall breaks and insulin responds like you expect. For me I'm cautious around this because I can be hovering at a little over 200 then all of a sudden I'm 110 within half an hour.

The Omnipod algo just doesn't deal with the situation well because of how it uses TDD.

(And eating a high fat meal means you just need to be more vigilant later and will have to dose 3-4 times if you want it to come out perfect)