Cat vomiting after eating

Hi vets! I am at my wits end.

My poor 9 year old orange kitty with Asthma (fluticasone inhaler with albuterol rescue) and mild HCM (no medication treatment) scarf and barfs all the time. I have to clean up vomit daily.

I have taken him to the vet and mentioned this all the time. All his tests have been normal and hes maintained his weight so she is not concerned.

I have an elevated slow feed bowl (which doesnt seem to slow him down).

Hes on a grain free diet of duck, lentil and peas - nutrisource purevita (allergy to chicken and chicken byproduct).

He is fed at 7a and 530p daily yet still SCREAMS at me for food all the time like hes starving.

I had a timed feeder, but he refused to eat from it.

I understand with the asthma, the pressure from the attack can trigger vomiting but this is daily after meals pretty much for 5 years.

Please help 😫