TvP Help Again!

Hello Day[9] Viewers!

I need some help with protoss..... again.  This time, it isn't the early harass, but instead late game.  How do you defend against archon, immortal, stalker? I know this might be a little out there, but if I am going MMM with tanks, how do I defend?  I am running HotS, I am silver and I am having a LOT of trouble against some protoss players and any help would be appreciated, even if it isn't specifically what I have said and about TvP in general.

Thanks guys!