If you want more tension you need (literally)heaver strings. A larger gauge will do the trick. https://www.bassstringsonline.com/
is great place to find what your looking. They sell D'Addario single up to .160
so all tension you want
unless your one of those subcontra guys
Personally I am not a fan of D'Addario's bigger gauges, but they work just fine as long as you don't have a low-B IMO.
There are only 2 brands I recommend for that.