The problems with the wings are like these:
(Joeku, hope you don't mind me posting your screens)
The mapping is perfect, all within the borders. The only thing I can think of is that the tga used for the wings is 512x512px while the others are in 1024x1024px. GP4 maps it like it's a 1024x1024px texture.
Since I don't have the problem anymore I can't really be sure. I did however recently changed my f1graphics.cfg. I've set reflect effect to 0. I know jpmfw uses that setting too, so could you please check your f1graphics.cfg? I will try out some settings as well.
It looks like I can fix it after all.
@Jax,
The mod is not publicly available, we're just beta testing.
[1991] [2003] [2004] [gp2 world series]