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Look up Mantic59's clip on Yooutube called advanced shaving techniques, I have the same issue, blade buffing and J-hooking does the job for me.

With a DE its the bar that stretches the skin, as I understand it. I know that when I use a DE if I stretch the skin in the same way as I do with a straight then I get irritation.

Don't aim for...

You may also find that its worth trying a range of blades (get hold of a sampler pack) I find some cause me irritation. For example Gillette Superthins, Wilkinson Swords and Astras are fine for me...