Two things required to have a trailer tow well.
First about 12% tongue weight.
The only way I know how to determine tongue weight is a trip to the scales or the use of something like the Sherline scale.
Second a trailer that is a little nose low when all set up. This helps prevent the teeter totter effect that a nose high trailer can give you.
After these two things are corrected then work on the proper setup of the WDH if one is used or required.
Sway control devices should be on all pull trailers to handle an emergency hard road correction such as a deer crossing the road in front of you.