But so anyways, by all means write exactly as you feel like writing. I'm a huge fan of DFW, for example, precisely because he is all fancy and colloquial at the same time, which happens to tickle my fancy quite a bunch. I just wanted to point it out.
Either you don't give a shit about 'them' and write as pretentiously as you desire, or, like myself, you adjust your style to distance yourself from 'them' because you dislike the association.
As it is, it's rather confusing to me because I can't tell the difference between you and the 'Eng lit academia' you seem to wish to avoid.
All that said: I don't think you write like a pretentious ass and I feel anyone should communicate however they want as long as the message comes across. And personally I like your style. So rock on, I guess :). But it's essentially what DFW is doing too, I think.