Please pardon my argumentative attitude: but have you ever examined, frame by frame, some high speed photography of the feeding sequence of a Detonics 45? I submit that your analysis would be different if you had.
Length of feed lips has nothing to do with the nose of a round diving towards the bottom of the frame ramp when the breach face contacts the rear of the cartridge. It's the very first thing that happens! (Regardless of the length of the feed lips).
Following the initial contact with the lower section of the frame ramp, the ogive of a hardball will NOT turn a cartridge any further down due to the length of the feedlips! Particularly, if the round is driven "straight into the feed ramp" (per your description) IT WILL TURN UP, not down. If the round hits the feed ramp and sticks there, then you've got a bad feed ramp, (again, regardless of the length of the feed lips).
When you say, "feed lips that are too loose", I'm guessing you mean lips that open up too wide, too soon; which has the same effect as feed lips that are too short. In that we can agree; as we do on weak magazine springs.