I'm working on a neck from an AG-1 kit and am having some issues with the nut. More specifically, the wood where the nut goes. If I place it flat against the maple, there's a gap between the nut and fretboard. Then if I push it up against the fretboard, there's a gap on the bottom.

Click image for larger version. 

Name:	nut1.1.jpg 
Views:	195 
Size:	359.7 KB 
ID:	39038 Click image for larger version. 

Name:	nut2.1.jpg 
Views:	203 
Size:	423.2 KB 
ID:	39039 Click image for larger version. 

Name:	nut3.1.jpg 
Views:	198 
Size:	336.5 KB 
ID:	39040

I believe I need to make the corner between the fretboard and the neck more of a 90 degree angle, but how? Another worry I have is that the frets are tall, jumbo size, and I don't think I can lower the nut much more without issues with string buzzing.

Thoughts? Advice?