I don't believe the weaker spring pushes the round up as much as it allows the top round to be tipped up as the slide passes over the round on its way back, pushing the back rim of the round down and thereby causing the bullet end to rise on the follower creating a stove pipe as the slide tries to go back in to battery. There is a video on another thread showing the round beginning to stand up as the slide is still retracting. The flat surface on the follower does not let the back rim of the round drop down enough to be contained in the mag. lips. The "Tiddily Winks" affect. My three new springs have taken a set to 4 7/8 from 5 1/4 from just setting loaded for a while. Seem to be flimsy springs compared to other pistols. Quick