I just installed the RB trigger ion my 917. The instructions leave a little to be desired. The creap is rough when you firsy start pulling the trigger. Is that normal and will it go away after some use. I read some threads about the sear engagment screw. Some say it is hardly ever used. Is this something you have to play with. Does anyone polish up the trigger where it engages the sear. It's my first trigger replacement and I want to be safe.