I dont see how you can shortstack live games because as soon as you double up you're no longer short stacked and cant just table hop to go south.
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General rule of thumb is that you can make more money if you cover everyone that you're better than, but this depends on you being good at playing deep.
This is key. Deep play strategy is different from full stack which is different from shortstack. Even vs total fish you may struggle with a deep stack not recognizing spots appropriate to call off or raise with.
At a minimum you should be proficient with fullstack strategy since thats where the majority of your opponents will be and there is tons of profitability to be had here. This is poker 101. Master this and then you can worry about deep stack.