Hello Sterling. Glad to see you're back. Pretty sure they go for sub 4 for the clock. Not sure about the splits - be interested to find that out too, as Im after a sub 4, too. Think it's better to do the negative split thing, ie run faster the second half, as you say, keep a bit of gas in the tank.
BTW, bit serious post for you, Sterling. Will we be digging this one up of the archives in a few months...