Well in my experience EU diamond they rarely do the 4 gate super hard. Just 3 gates then make the robo can hold...sometimes. If you micro really good and he screws up his micro. Or do the 3 stalker defense build.
PvT on shakuras....
You need a better read on terran. Getting into his base and seeing no gas and only 1 rax....i would have guessed fast CC maybe 3 rax mostly marine. I'd have planted nexus after cyber. Used the zeal and stalker to hopefully see a bunker at his ramp. If no bunker and i see a lot of units then i cancel nexus and make gates. From my estimate the bunker would be half to 3/4 done and you could have done some damage then left knowing it should be a CC since gas so delayed it'd be really slow tech. Your second chrono on nexus was late. Should spend more chronos on nexus.
After seeing an orbital already at 2nd i wouldn't have made those sentries. I'd make a robo bay instead at that time. Abandon double forge completely. Your expo too far behind his. Robo bay done at ard 9.35. Make 1 colossus. Done and at his base by 11mins. Before this the probe at xelnaga would have made a pylon near his base like at his possible third. Should have enough to break him and hopefully make his expo CC have to lift. Focus everything to getting that 1 colossus out. Then probably need to make 1 more gate to use up resources. Then hurt him badly while extended range and a second colossus is making. After that double forge. Then go for the normal 2/2 colossi but you rearranged it to get colossi first since your expo was behind so much.
Now on to watching the other replays.:P Hope that was helpful. I used the advice i suggested before. Both the checking for bunker and just fast colossus cos his expo was sooner.