I did some work on a buggy fitted with a 2.2 t1 engine thats was turbo efi. the overboost cut was brutle and split a barrel. took a while to sort that one out as the boost ignition retard was also all over the place.
the main problem with the boost cut was down to the poor cb header design with the waste gats off one header runner and the big turbo making so much boost the waste gate could not control the boost limit, even with the waste gate open the turbo could still produce more boost than the ecu was set to cut.
with your new settings i would think your'll run out of road before the cuts come in :
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