I agree with you that zaps and reposts are the highest signal on a note but I always hesitate with the order of the two. Zaps gives it real value but reposts puts them in front of more people, and potentially more real value can get assigned to it. But personally I think comments are extremely valuable since they can create a connection between two npubs.
Discussion
my rule of thumb is simple: i look at every note like it came from someone with few followers. if i think it deserves more reach, i repost. if it’s from someone with a big audience, it’s already getting out there. zaps are just a thank you for me, whether on a note or a reply.