I gotta weigh in here, I am one of those people that cringes when ANYTHING needs to be "slammed". If the hood is adjusted properly it shood latch neatly when dropped from about 6 inches OR when closed with a firm, open hand on the area directly above the latch. The soft top lid is a different story, it is not heavy enough to close by dropping but I would never "slam" it, rather, a gentle push-to-close, first on the driver's side and then on the passenger side. I think if you have to either slam or force the issue it is probably a matter of adjustment rather than technique.
And thanks for the opportunity to vent. Now I won't have to say "don't slam it, please" next time my wife goes to close the passenger door...it is out of my system!
g
'64 230sl, fully sorted out...ooops, spoke too soon