So, I purchased a cheap pear tree from a big box store with the thought that I could practice grafting on it and maybe get a multi-variety asian pear tree out of the deal. I was planning on dormant (whip and tongue / cleft) grafting but with the recent warm weather it broke dormancy and started pushing buds. I've considered doing a bark graft as I've seen multiple tutorials on this, but when I try to peel back the bark I notice that the "green" which I assume is the cambium layer does not seperate cleanly. Some appears to pull off with the bark, but there is also a significant amount sticking to the "wood" underneath. It also looks rather rough on both sides as if it tore apart.

Is this normal for bark grafting or would one normally wait a little longer so that things seperate more quickly?