explorers
fish all explorers like that, its because of the front strap button, to fix it you can either:
1)most effective way, send your guitar to a luthier, tell him to take out the front strap button and put it behind the neck, no more neck diving 100%
guaranteed
2)get leather straps with the rough side, the friction kinda helps a little
3)if you're using active emg's, upgrade your 9volt to 18volts (2 9volt batteries), this adds a little weight and also, makes the pickups sound even nicer. if thats not enough add more weight, like fishing lead weight but of course stuff with sponge also, so as to not damage the internals.
the best would be option 1 tho