Ok first of all the neck position needs to be determined by measuring the scale length. The tang pretty much never gets pushed hard up against the pickup cavity.


So you want 628mm from the inside of the nut to the high E saddle on the bridge (don't measure to the 12th and then from 12th to the bridge, the fret placement is fine, the overall measurement is more accurate for this), with the intonation adjustment wound most of the way forward. You can wrap tape around the posts to temporarily install them without pushing the inserts in. This is also a good time to check neck alignment by temporarily installing the low and high E tuners and running some ordinary string down to the bridge. Make sure they run with an even gap down each side of the neck and you are all good.

Here's a pic of me doing that on an ES kit (Lying on the bench is better, this one had a really tight neck fit so it could sit in the stand)

You can see the neck tang stops short of the back of the neck pickup route.



Once you've done that, recheck the pickup ring. I've done one of these kits and it was fine, but you might have to slightly enlarge the route to shift the pickup down a bit to accommodate the ring.

This is definitely an issue on the EX kits, but first time I've seen it on an AG, so confirm the above and let us know how you go.