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Faster respond for midi application ?

I am using nrf52 , it's always connected to an iPhone, and I need a truly real time respond. I am sending short messages, like 2 characters at a time, and play a sound on the phone according to the messages( e.g "A","B")

Right now, it's fast but not enough for , lets say, play music, there is a 80-150ms delay from when I push the button , till I get the data on the phone, so if you would like to play a song it would be slowly.

Is sending new data every time via characteristic is the right way to go ? or is there another way like doing it without connection, and updating advertising data only ?

How you get the fastest respond for very short messages? what you usually do in these cases ?

Thanx