Hi Fringo
That sounds way too much to be dribbling out. Are you doing everything by the book, like a vertical airshot first, leaving the needle in skin for 10 seconds after pushing the button (maybe longer for a big dose) and varying injection sites? How fast are you pressing the button? Easy to slip out of good habits over time, I know. Are your cartridges approved for use with the Autopen?
Background retinopathy only starting after 20+ years isn't bad going, but if you can get your HbA1c down, those changes may well disappear.