Water balance issues since going over to an unvented cylinder

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A year back I had a new unvented cylinder installed to replace an old vented one. As you can see from the attached diagram, no balanced cold feed was taken from the back of the PRV. The cold feed that supplies the kitchen and bathroom remains as before, and the fitter took the existing feed to the loft tank for the cylinder.

When the bath is being run, the kitchen taps dripple and Vice versa. It appears as if there is not enough flow. The PRV was checked during a recent service and was found to be fine. Any ideas?
 

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1. Did you have the incoming mains water pressure and flow rates measured before the installation. If so, what were the pressure and dynamic flow rate readings?
2. Do you know the diameter of the cold water pipes?
 

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