Great stuff, I love XP2 in black and white chemistry!
I do a pre-soak in distilled water and then 5ml Rodinal and 600ml water at 70 degrees.
Agitation for the first minute only and then a couple of tips back and forward, then leave it stand for an hour and fix and wash afterwards.
I got my technique from a local photographers blog, link below.
My results have been very good, similar to his.