I’ve been backwashing. I have a dial on my pressure gauge that show the starting psi and backwash psi. I’m also adding DE after each backwash to try and speed up the filter process.One more thought. How are you managing the filter. You should do a good backwash. Note filter pressure (let's say it is 12 when clean). When the filter pressure rises to 15 (25% above clean pressure), you should backwash. Add this check into your routine. Take pictures for yourself, 9, 3, end of day. Use a picture of the steps at first to note progress.
Frequency and diligence should provide you results.