Finally had some time to look into your build.
Generally I think it is a bit on the low shielded side to survive a multiple-player gank, it would even cut too close for my tastes against single high-dps outfits.
I survived an attempted gank with my Anaconda with 800 mj against a frag FedCorvette just barely, with 3% hull. Next engagement with 1100 mj was a piece of cake, I survived without hull damage. With my 950 mj Krait Phantom I survived everything DG2 could throw against me. But as said before, if you run into a 4-wing gank you're generally toast if you make just one single mistake, like wrong pips (yours was correct by the way, 240 is the classic mistake, 420 is survival), or fumbling with the escape system or getting hit by a grom.
The second thing you said I want to comment is the 60 second remark. I know timeflow is strange under attack, minutes seem like instantly gone, and seconds seem like eternities.
But a highwake takes 15 seconds plus the cooldown if you submit (and you ALWAYS submit!), so even if hit by a grom you should generally escape after the cooldown in the span of a minute. So I guess you made another mistake here and either didn't submit or botched the highwake. You can preselect a system in range and apply a button to that choice. That's generally the first thing I do if entering a contested system.
If you're in a non-PvP outfit, the first thing you should do is check the bandwith. >600 bit and there is another CMDR.
Second thing to check is if its a rectangle or triangle. Nowadays that's a bit unclear, as most gankers activate the interdictor only shortly before, and explorers run as triangle due to FSS activated.
Obvious "problematic" ships are Kraits, FdLs, Corvettes, Cutters, etc... If you are sufficiently far away, you
can scan them to if they are in a wing (bad sign) and/or if they have an interdictor (bad sign). Also you see if they are wanted (very bad sign) or if they have clown avatars (murderhobo sign

)
If there are any bad signs, it's up to you: continue? drop to normal space to possibly change the instance? highwake to next system for another try? All possible.
And the last thing you can do is use another mode - which is perfectly viable. I played more then half of my 2900 hours in Mobius, that's totally cool.
But don't blame the game, or open for mistakes made. And please don't try to tell others open is a hellhole. It's not. Certain systems are dangerous, and if I'm in a ship that stands no chance to survive an attack, I have no problems to fly to an engineer in solo. But generally open is another completely different game, because you
can run into danger about everywhere, and nothing is as predictable as it is with NPCs.