Hmm... I don't quite understand. Why do you ask about my TFM_UPD table about Share in syssetting file? You said the problem was about ~FI_T table, where you specified LO in the the Limtype column. And the example file you provided only contained such a ~FI_T table.
The ~TFM_UPD table in Syssettings is used only for defining default interpolation options. It does not affect the original parameters defined via ~FI_T tables. So, it only adds interpolation options into the SysSettings scenario.
The ~TFM_UPD table in Syssettings is used only for defining default interpolation options. It does not affect the original parameters defined via ~FI_T tables. So, it only adds interpolation options into the SysSettings scenario.