I would agree that 14psi does not sound excessive, although this will vary with ambient temperature and driving conditions.
From a recent post I made in another thread, the following pressure caps are available:
grey = 150 kPa (22 psi) superseded by the green cap
green = 150 kPa (22 psi) standard issue for all 700/900s
white = 100 kPa (15 psi) uncommon
black = 75 kPa (11 psi) standard issue for 140/240s
yellow = 50kPA (7psi) intended for industrial plant.
Change to a black cap and your coolant pressure won't exceed 11psi. However, this will also reduce its boiling point and likely cause your car to overheat under certain conditions.
I would only start to worry about a situation like yours if my coolant were routinely exceeding the 22psi limit the manufacturer intended. I replace my coolant periodically with fresh and flush the system. This all helps to keep it working efficiently.
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