Learning claw

Playing for a while now and always ending up around high diamond.

Decided to go ahead and learn 4 finger claw. After messing around with it, i feel fine using it but i have 1 MAIN PROBLEM:

When i start firing, since im putting my index finger slightly on its side, my screen detects it as if i moved my finger from its initial placed spot alittle towards the edge of the screen. It makes sniping very hard.

How did you overcome this? Did you encounter this as well?