But I struggle to see how you can analyse the path the writer is directing you down, the specific ways in which they do so and the intended impact of these chosen mechanisms, plus any discussion of societal impact, in 500 words. Long analysis doesn't equal 'crappier' analysis. It also doesn't implicate that you choose every single technique. Personally, I choose the most evocative, the most contentious, and pursue it in-depth. Ceraintly not the only way, and definately does not ensure success, but if you running at 500 words I can't see how you've analysed, identified intended effect etc...
At the end of the day - each component is marked equally. You get three hours. An hour a piece is the recommended allocation; and if you spend less/more on a piece then you run the risk of compromising its quality. Text may be the hardest to do well in with limited words, but that doesn't mean you have to spend longer. An hour is plenty of time to structure it. Eliminate the flowery crap, demonstrate to the examiner that you know what the topic is about, what the text is about, and - most importantly - the intersection between these.
I'm not delibrately targetting what your saying... i just don't agree with it :p