Jaye - for sure you haven't earned respect points showing up here with this strat
jokes aside - strat trem is notorious for an effort and number of tricks required to keep it in tune and yes, its not Floyd Rose so divebomb will bring it out of tune. I have read many (and use few) tricks to keep it in tune as possible, some of them are here (yes, I have strat too...):
- get decent nut. Some cheapo nuts are the problems themselves
- try different cut on the nut, for some (e.g. EVH) it was one of the ways to cope with it before he find his way to FRose.
- lubricate the nut, I use some silicon lubricator used in some electronic machinery, but big bends nut sauce I guess does the thing too.
- try to leave minimum necessary string wounds on tuners, some say it helps.
- I also do extreme string kick in excercise - pulling them hard in different places, it helps too.
and there are lots of tricks out there, which may work or not. Try yourself and decide what helped in your case. From theoretical standpoint the weakest links are string trees and nut, which doesn't allow strings to come back to initial tension, so focus there.