How to attach entity to the player?

I know that there are plugins like keilders that does this but I was wondering if there are other ways. I’ve been trying to attach the mob to the player via set location block. (I set a NBT tag “owner” to the mob so it only attaches to the owner)I’ve also tried the follow block but both seems to drag too much. In my mod the players flys around so the dragging is very visible. 

If there is a way to do this better or just straight code pls I would like too know as I can’t find anything on this topic to learn.🙏