i brought my Ibanez XPT700(Xiphos) to the guitar shop and asked him to drill new holes for the strap buttons because mine was nose diving, but it still nose dive...i was just wondering if someone one knew where exactly to but the strap buttons. i am using a nylon strap also, and i know it doesnt help, but i plan on buying a leather one, but i am still not confident that it will stop nose diving once i have a leather strap.
it's weight. Try re-positioning your strap on your shoulder so your neck is higher in the air. It may be uncomfortable at first but it's worth a shot.
i think it might be cuz the neck is just heavier than the body cuz xiphos have very small bodies

i have a mlxm and its made of really really light wood and it nose dives