The boost target map may peak at 1.24 bar but the WGDC (wastegate duty cycle) also needs to be set correct to achieve this.
Your map has a 'initial' and 'maximum' WGDC map.
Set your logger to log as a minimum wastegate duty, boost, engine speed and throttle angle. Then load the wastegate duty map and the boost map onto the screen and run them as a ghost map. This should then trace the actual boost and wastegate duty onto the corresponding maps (as you rev the engine you should see the ghost trace move over the map).
What you may find is your hitting your max wastegate duty before your achieving your target boost. It won't hit target in 2nd gear and may be a touch low in 3rd, but 3rd on the five speed is a good gear to get it there or thereabouts.
Running in 4th and 5th should see it close to or slightly over target.
Do a 4th and 5th gear pull from 2500rpm and run through the revs for a little while until boost has stabilised (it seems weird but it does check for good boost control). You don't have to use the full rev range, just enough to get comfortable that boost has built and levelled.
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