Are you wrapping it tight with a rubber band and clear grafting tape after? cutting with a sharp grafting knife?
I can’t tell easily how crisp the angle is… it’ll probably work out if wrapping tightly with grafting rubber bands… but with a nice evenly-sized scion and rootstock like that i would not do a “Z graft” and just do a whipNtongue or cleft graft. as it’ll be harder it to get “knocked off” i think.
I’ve had some not perfect clean angles and they still take … but like this is one of the best pics of a clean “whip n tongue” graft in below link by @TNhunter. Sometimes i get them that clean too, but not often :).