There are a lot more issues that need attention, rather than this. This is just a minor thing that has been carried on for long since vanilla.
And with the range of availability of commodities and ores to trade, I dont think people even trade perishable commodities anymore, if not for once in a blue moon.
My suggestion would be to keep it as it is, or just remove the perishable ability if that can be replaced by something much more concerning.
It would be awesome if the most valuable cargo was perishable at 10% a minute. Pirate hold ups would be more risky for the trader! No more flying to the end of space!