a2psyklnut

O.K., you've got a F400 with probably what? A Rock Shox Jett fork on it?

Is the Steertube Huge (BeerCan Size?) and has some reducer cups, or is it similar in size to the Trek's?

There are a lot of things you can do to affect the steering of the bike. Relize that the longer the stem, the slower the bike will steer. The shorter the stem, the quicker it'll steer. Also, the wider the handlebars, the slower you'll steer, however, you'll have better leverage.

For a more XC Racing oriented cockpit, generally you'll see a longer stem 110 to 130 mm length with either a 0 degree rise or a 5 degree rise. The usuallt run a flat bar in about a 24 to 25" width. The bar usually has a 3 degree sweep to it.

The current trend for freeriding and general fun rides is to go with a shorter stem and riser bars. The stems are usually shorter 90 to 110 mm length, the riser bars have a 1.5 to 2.5" rise to them and have a 5 degree sweep. Plus, they're usually wider about 26" min.

One of the most significant changes you can make will be to swap out the forks to a better, more responsive fork. Then, switching to a different stem/handlebar combo.

Good Luck.
L8R