10 psi for 5 days (@ 38-43 º) is too low,too short a time.
You'll need a 3-4 weeks at those settings to get to where you want to be.
At 10-12 psi it takes me roughly 3 weeks to get a keg to proper levels w/ my kegerator set to 34-35º.
The gas isn't dissolving,that's why you're pushing foamy flat...