ilford HP5 4x5 film tray develop w/Rodinal. Suggested development time.

I want to start developing HP5(hp5) in trays.
I plan on using Agfa Rodinal or equivalent. at iso 320-400
any suggested development times? and dilution? ie. 1:25 or 1:50

I am having trouble finding any acurate info on time. especially related to tray development.
Also the times I have found are conflicting.
thanks
ps. I do not care about grain size. Only even development across shadows and highlights.

http://ilfordphoto.com/Webfiles/20106281054152313.pdf

See page 3

Time will need to be adjusted based on your agitation.

Gentle sloshing 10 seconds of each minute start at the listed time. Constant agitation reduce time by 15%.

"Season to taste from there."