now i understand, If you are using ESS WDA i though you also were using MSS WDA? is that not the case? what you use for MSS overview page then?
HCM_MSS_WDA_1 is required for sure
Landing page we refer to only UI5 based page ie sapui5 etc which comes with not above switches but with switch
ie this HCM_MSS_UI5_1 http://help.sap.com/erp_hcm_ias_2013_02/helpdata/en/2a/c9725198e02066e10000000a441470/frameset.htm