Not sure what the recommended velocity range is for those 350gr Woodleighs, but IMHO you may want to think carefully about pushing the envelope too much when after something tough like buff. I personally see no advantage in pushing them past 2400fps which would be plenty fast enough out to well past the distance at which I'd consider shooting at a buff. Just a thought...

Edit - having just read that back to myself, I realise that buff is not the only game in town being considered...