Well, look at it this way.... you did the best job you could given the difficult situation. Congratulations on the problem solving, it shows you know your stuff. It's never as good as it would have been if everything went perfectly but the skills will serve you well on the long road ahead (I assume you intend to go professional?) As your skills improve, you'll be able to compensate for even more difficult situations. I know way too many people who just give up.
My day job's in a slightly different field and I learned the hard way too. We got good enough at solving stuff to the point where I and my guys are now called as the 'last resort crew' - the people they send in when ALL ELSE FAILS
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(not always sure whether I interpret that as a compliment or just another call to do stuff nobody else wants to do

)
Oh, something that just occured to me. If using the Sigma flash to trigger your studio strobes optically, set the Sigma to manual mode, and go to the lowest power rating you can use. Increase power only if the strobes do not trigger consistently. Point the flash upwards at the ceiling or backwards, you want to bounce it away from the subject while still allowing the strobes to 'see' it. Quite a number of the monolights I have seen have the sensor on the back.
And Twix is good eating too...
