Short leftside bars

Will shorter left side trailing arms give you more forward bite or just react quicker?

React quicker.

In theory, you could gain a small amount of bite. The shorter bars gain more angle faster. More angle equalls more bite, to a point.

usually with short bars you gain some instant traction but you end up with more steer gain than actual forward bite. a longer lower bar (on the lr) with some uphill angle will give you more traction and less steer but can cause a throttle push.