Could you explain a little more about the mechanics/physics of the strong recoil spring causing the cartridge to "jump" the magazine?
I'll give it a shot.
First, understand that once the slide starts to move and compress the spring, there's a separate action/reaction system in play with the spring as the vectored force between them. The stronger the spring, the harder it pushes on both.
The upcoming round in the magazine doesn't settle down instantly. It bounces around a bit. When the spring starts to push the frame back, the round obeys Newton 1A and tries to stand still. Then the slide impacts the frame, and tries to jerk the gun out from under the cartridge...so the cartridge winds up further forward in the magazine at the very least.
When the heavy spring accelerated the slide at a higher speed, and it collides with the waiting round, its momentum can knock the round completely loose from the magazine, literally chasing it into the chamber with the nose of the extractor against the case rim.
If the extractor snaps over the rim, you're never the wiser...until your extractor starts to lose tension in a couple thousand rounds...or fails. While a proper extractor is designed to allow a snap over in an emergency, it's not supposed to do it indefinitely.
If the magazine follower doesn't have that little bump on top, the round can get loose when the slide impacts the frame...or it can be barely held by the feed lips, and when the slide collides with it...it's out. If you've ever had a slide locked to the rear with the last round lying loose in the port on top of the magazine...there's your sign.
With a weak mag spring and a heavy recoil spring, sometimes the next to last round will jump the magazine...the last round will bump it out of the port...and the slide will feed the last round. If you've ever found live rounds among your brass...heeeeere's your sign.
That little dimple and the correct springs are important.