Limiting throttle end point to reduce power?

[Matt Airbrushing]

Im racing a B4 on grass.

I bought a LRP SXX-TC speed control and a 5.5 LRP motor second hand.
This combo was very good value, so I couldn't pass it up.
I figured this motor might be a bit much for a B4 but its much more powerful than I expected.
The last time I raced was with NIMH and brushed motors. LIPO and brushless has so much more power.

I just gave it a quick test and the car is stupidly fast even with the speed control profile on the lowest setting.

I can gear the car down a bit more to limit the top speed but its still going to be a bit monstrous.

If I set up the ESC and then turn the throttle end point down a bit will this put any extra load on the ESC?
That way I can make the car a bit more drivable.
Or is it not a good idea to be running at part throttle all the time?

It might be that im worrying about nothing but if the car is too quick my brain wont be able to cope (im no pro driver)