Hey Rambuck,
I was loosely following Jamil's Irish ale which has a bittering hop addition only (i think:smack:) I think this is why it is so NCish. I do not get much late hope character from New Castle either.
Anyway, if you like late hop additiions, then definitely go for it. Just be sure...
Weeeeellllll, maybe... using the Mr Malty pitch rate calculator, yeast with starter can be replaced with yeast slurry of the appropriate amount. If its an ale you are pitching into, then we want some growth and some lag. If an ale takes off too soon it may be low in esters and less flavorful...