Without accurate before and after test data no one knows what the wedges are really doing. To compare you could run speed/fuel burn trials if you found another IG36 with identical power train, props, and identical loading and bottom smoothness.
I would just leave them alone unless you are running 1000+ hours per year.
The US Navy found adding wedges always improved speed/trim/fuel burn on any vessel they tried them on. Typically they are running heavily loaded hulls at slightly above displacement speeds.
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