Highly dilute developers

I use Tri-X in 4x5 sheets, and I am interested in exploring the use of highly dilute developers (Rodinal, or HC110, probably), to maximise tonality and highlight compression in longscale subjects. Otherwise known as compensating development! Has anyone tried this, and is willing to share their knowledge and experience? Is there a major grain disadvantage that appears with very long development times? Have people found a reliable method(s), for a longscale subject, to compress the highlights towards a curve similar to that for a normal scale subject, and still maintain good local contrast/tonal separation?

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