what year / spec is the car.
1.3bar it too high if it is running a standard ecu map.
Sounds like the boost pipes could do with a clean, or if it is a pre96 the restrictor is missing from the bottom hose of the boost solenoid.
Post 97 the restrictor is in a different place and works in reverse i.e smaller hole = more boost. So if it's blocked with dirt or oil it will over boost.
The reason it only happens in 3rd+ is that the ECU will only trigger fuel-cut safety if overboosting for a certain period of time.
In 1st and 2nd if it overboosts it will be very quick, or it may not actually achieve the same boost. Normally it's a tad lower in the lower gears.
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