Thanks for reading, I appreciate it. In my main floor bathroom, my cold water sink tap has incredibly high pressure. All other water sources in the house seem to have a normal operating pressure. Even the tub in the same bathroom from the same line only feet away has normal pressure.
I swapped the hot and cold cartridges in the taps to see if the CW cartridge was the culprit. The CW cartridge worked fine in the HW tap. With the HW cartridge in the CW tap, water was still blasting out. Not a cartridge problem.
I do not have a pressure regulating valve on my main water line.....not sure I need one, pressure everywhere else seems fine.
I`m stumped. thanks for your insight.