Literally the point of running around so much is the risk you parttake by being a criminal and its part of not getting caught. Criminal RP is already balanced currently regarding the drugs and pks. The reason why there is a massive increase or decrease is either due to some events like racket events coming up or people just being burnt out for processing over and over again. Larger quantities will decrease risk and is unrealistic. The heavier you get the slower you walk/run, eventhough it sucks, the constant running like its a chore is part of being a (sr.) Associate and a made man till you eventually move up the family tree.
-1 keep the drug transporting as is, cause everyone else will create suggestions for clothing bags and ways that there will be more bags to "carry" more