Port Drayage/ Rail container PERCENTAGE pay

Looking for a port or rail company to lease on to, one that pay percentage or (pay the miles separate from the fsc) if you know of any such company PLEASE let me know. Im new to the container world, i just lease to a carrier and i notice they pay one rate which is the miles and fsc added together. the problem with that is we all know fsc change every week but my rate per mile never change, im looking for a carrier that either pay percentage or have a break down of miles and fsc separated. That way I get 100% of the fsc and my mileage rate stay the same. The way this company is paying us breaks down to simply this, when the fsc goes up our rate per miles go down. After thinking about it that's HOW I UNDERSTAND IT.