Yeah what you said is correct.
Its the same principle with real cars, even stall convertors.
Trade off is it can be twitchy to drive in its engagement because it will transfer lots of power straight away.
I see a few people that over clutch their engines and do well but it can come down to driving style and smoothness as well.
I would generaly tone down a clutch on a 5 port on a slippery track making it more drivable with softer springs as with having heavier springs the engagement will be higher in the rev range and will cause wheelspin.
If it was a 7 port i would run heavier springs so its up where its making good power.
Comes down to personal preference, driving skill, and controller setup so "each to their own" to say
Having heavier springs will make it very "Snappy" but if traction is good this can be well utilised.
The heavier the springs, the less RPM range you have in your power band and will take some drivablity out of the car.
Hope it helps :}