I noticed the same that car really has the understeer-problem on asphalt with box-stock setup.

I made some tuning and found quite reasonable setup (not the final version, but now the car is really turning into curve):

Alternations to the box-stock setup:

FRONT
=====

- XRay 25WT Shock Oil (is about the same with box-stock)
- No sway-bar
- Remove urethane rebound bushing from shock-cap
- Camber -1 degree
- Droop #5 (measured under outer hinge-pin)
- Front suspension-block "D"
- Ride-height 5mm

REAR
=====

- XRay 25WT Shock Oil (is about the same with box-stock)
- No sway-bar
- Remove urethane rebound bushing from shock-cap
- Camber -1 degree
- Droop #4 (measured under outer hinge-pin)
- Ride-height 5.5mm

Here is additional data about my car:

- Front diff is replaced with one-way
- Motor: Novak SS5800 (only allowed brushless motor in our national 17T-class)
- Battery: IB4200 6-Cell
- Tires: LRP VTEC 27R preglued (only allowed tires in our class)
- Gears: 23T/81T