Make certain the mainspring is properly seated; dry fire; go to the range. Then see if it's still an issue.

Suggest you don't shave the strain screw or bend the mainspring.

If it continues to be an issue, return it for another factory mainspring, and consider one from Wolff, too.

Each individual gun, even within the same series, has certain unique variables with how it responds to -- you guessed it -- each individual mainspring, even within the same design.

Sometimes you have to experiment with a few until you get the right feel and reliable ignition.