advice with reactivity

Wanted to write on here as I couldn’t find anything that was specific to me and the situation.

I have a one year year-old cane corso who is the most loving Dog you’ve ever meet whenever we let him off with dogs on the occasion he is so submissive and it’s a gentle giant however when we see dogs on the street and he is on leash, he gets extremely reactive and box and growls and starts the pull however if he did get the opportunity to go over to them he would be submissive and show no signs of aggression. I am working on this by when we see a dog before he has the opportunity to bark or get worked up. I let him see the Dog calling back to me and offer him a high value treat. Let him see the dog again before he does anything and then eyes back to me and he gets another treat and then we carry on walking, which is going well. However, I’m not sure what to do on the occasion where he does react like today we had two great instances of him looking at the Dog and attention back to me without any reactivity then we had one issue where we were just leaving the house which I understand may have a part of it as he may be feeling territorial as he is at the front door and I know that they’re all gonna be times where we take a step back and I am proud of him for having two good steps forward today even with one step back but w