Tweaking Pfeba lip?

[Cracker Red]

The lip I bought came in today. Center section of the bottom hangs down a bit. I'm unsure if this is just how they are, or if it's something that can/has happened over time and can be fixed?

Heat gun ?

[E30_Pare]

Mine was wavy in the middle section. So I got 2 planks of wood, some c clamps, & a heat gun. Heated up the section till I figured hot enough. Took the wood and clamps & squeezed it flat.

I'm not sure if this would help you, but that's what I did.