While that's probably not what you want to hear: Why not fix the software issue with the XGA projector and then create slides with not less then ~23pt font size

While that's probably not what you want to hear: Why not fix the software issue with the XGA projector and then create slides with not less then ~23pt font size for the code? This is a trivial remark, but: Better show less code, with foreground and background colours, bold font, etc. -- showing too much code on a slide is like showing too much equations: it takes the audience a lot of time to read and understand your slide. Certainly too much time, compared to the speed you wanted to rush through the your slides ;)