With only one round in the magazine does the cartridge tip upwards in the front and downwards in the back?
Does it do that with two, or more cartridges in the magazine?
With the slide removed, if you insert the magazines (with no rounds, one round, two or more rounds) do the bullets contact the slide lock lever where it sticks out above the magazine?
These are .40 S&W in a P07 but notice the difference in slide lock levers (9MM and .40) and how one makes contact with the bullet nose?
I know you're not having this issue with a .40 S&W but there are different slide release levers and you mentioned different angles with the top cartridge in the magazine. Do you see contact with any combination of cartridge/angle with the slide stop?
How clean/lubed is the slide lock shaft/frame holes/spring? Does the slide lock move up/down freely or does it bind/drag while moving it up/down by hand?
I've never bent one of those springs but Tok36 will help you with that.