for the break in just follow what the losi, manuel tells u to do there pretty good at giving good info.
as for the brake bias i usually run more rear brake. then the front just a little brake on the front, i tried more front then rear and to me it seems to make u, lose your rythem and steering also. when your racing it does
just dont set the brake bias where. the front or rear brake locks up,
just enough were it slows it down. i woudnt worry about that intil your engine, is broken in though.
the manuel that losi gives u tells u how to set the brake bias and throttle linkage up.