I had decent success in 2019 and 2020 grafting both apples/pears. I would say 60-75% success. Last year I showed a couple buddies how to do it, after a few too many beers their grafts began looking rough. I was certain hardly any of them would make it. Last year I purchased some bulk paraffin wax and a mug warmer to melt the wax in a tall glass. After grafting and wrapping the grafts with parafilm I dipped the entire scion and graft into the melted wax. This seemed to be a game changer for me, I would say 90% success on my grafts and over half of my buddies grafts even took. I will be doing this every year now. This may be something for you to consider.