When I fit sweeps to my MO5 , I normally use short TRF White springs up front and stand the front shocks up, using the outer or second outer hole on the Tamiya shock tower. I also run less front toe out and adjust the end point on my radio.
Just using radio settings may settle your car down without adjusting your setup. The harder springs will take away some of the front grip.
There are other things you can try but start with the above first.
Regards,
Calvin