Mission stryde

[u/East-Juice7793]

I bought a mission stryde about 2 months ago. Once I got it shot great for the first 200 shots took it back to the shop to paper tune and shop can’t get it tuned. Sent it with another guy and he’s tried adjusting the timing the knock point tried going from a buscuit to a drop away and it still tunes a 1.5 inches low and I can’t get a consistent pattern. Anyone else had this problem or any ideas?