hmmmm....it was daylight right ? :)
with an F4 lens, seems you should be able to do f4, ISo 200, and still have at least 1/250 shutter speed...which will work ok, could your metering be off ?
fwiw, I use center averaging (similiar to spot) metering. this is better imho, over matrix/whole area, since you want the subject metered and to heck with the background, lol.
Also I use Aperture mode.
just seeing if I can help ya get away from having to PP noise.
I can see where you will want higher iso, at the first turn and other shots, to use a f stop that will have a good dpeth of field/focus. your shot there is quite good, I always mess that up...forget to think about what's best!