Don't worry about what you see in others, listen to your own playing.
Get the bass checked out it maybe pup problem. Also you may have a dead spot on the neck, un-even fret area etc.
String wise, check your gauge. I alway opt for a set that is even in gauge, so .20 between each string. As the bass is tuned in 4ths there no need to have strings where the gauge reduces or gains though a set...even string gauges means even tone...especially when doing walking lines.
As you have listened to your playing and identified an problem area, check it out properly to cure the problem at source not cover it over.
There are some great exercises out there to help your hands work better, and if your hands work better, your tone improves in many more ways that a comp/limiter just cannot do.