Since you are getting 6th CPC Pay, you will be governed under 6th CPC orders for your transfer entitlements. As a result, you will definitely get only Rs.27 per KM for transporting of personnel effects for the given quantity of entitlement. As you may be aware that the transfer entitlements would always be counted for the station where from you have moved out i.e. last served station category. Since you have served and moved out from Z class city, you will get Rs.27 only after applying the increase element of DA crossing of 50%.
Since you have requested for documentary proof, you can verify GOI, Ministry of Finance, Department of Expenditure OM No.19030/3/2008-E-IV Dt.08.06.2010.