It sounds like extra sediment is finding its way into and through parts of your system .
Some RO units have flush kits so you can flush out caught sediments before they get to the next stage in the filter .It just depends where in your filter you place it .
My system has a flush valve but I don't need to use it .
Did you get your pump hooked up yet ?
You are running 5 micron then 1 micron sediments before your carbon ?
Have you had a lot of rain lately ? possibly your supply is less clean then usual hence the raised TDS ..