if you are pushing it that hard your going to have to remove the stock safety features becuase the levels are above the visible limits, which you dont want to be doing. iirc the absolute visible limit of even the later ecu's is just under 1.7bar. You want to be below that level with tollerance so you don't overshoot, so in reality your limited to 1.6bar give or take. Bear in mind this is more a general comment regarding swapping to after market when you go up the power level.
The boost control in the stock ecu is fine at lower levels of boost even on the early cars, although i agree they are showing their age, but at that point your then back to a case of looking at replacing the whole unit as boost control isn't the only issue.
Makes external boost controllers a waste of money and setup time.