I had the exact same issue when I shot my new G17. I was sure that the gun was defective until I shot from a rest and realized it was all me Some people don't have a problem with Glock triggers but I definitely do. With practice I improved but I could never shoot as well with my G17 as I could with my 1911. I finally started experimenting with connectors and settled with the "Ghost PRO 3.3 lb Trigger Connector". My low left issue almost immediately disappeared and have been shooting much better since.