[Next_rim]

I got burned hard in two recent PvT's for bad opening reading.

So, I generally scout with 9-pylon probe, and usually am able to keep it alive till I see the rax addon (or no addon, which is also information). That is, when T gets standard 13-gas and orbital.

Game#1 - I go in, scout no standard 13 gas, therefore no addon. Probe dies to first marine soon, so I'm thinking - all-in. I respond with forge after gate, no gas, 2x cannons and ramp block. Nothing happens. I send a probe, but it dies mid-way to 3 marines. I eventually get to my 1st stalker, go scout just to find out he did a 1-rax gasless expand. Opp is masters.

Game#2 - same thing, I scout no gas and rax, think it's marine scv-all in, get a forge up, just to discover he later did some weird 2-rax into double-gas into starport+banshee. Idk, maybe he was just bad and I overestimated my opponent, or he was playing mindgames. Opp is diamond.

So I have three questions:
1)Am I responding correctly? I mean, forge is 100% all-in proof response, but sets you back on wpgt tech. I have very hard time repelling all-in with standard 3-gate.
2)Are there more signs to look for to tell gasless (or delayed gas) openings from all-in? Depos? SCV count? Orbital timing?

3) A little bit unrelated, but if he does rax+depot at bottom of ramp, how can I tell reactor hellions from marine-scv all-in? Marine count? Anything? Some people don't do the +depo from orbital, and ptu straight 2nd depot in base, so this is not 100% way to tell.