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Does Apache Tez run slower than hive on larger dataset (~2.5 TB)?

We have started to look into testing tez query engine. From initial results, we are getting 30% performance boost over Hive on smaller data set(1-10 GB) but Hive starts to perform better than Tez as data size increases. Like when we run a hive query with Tez on about 1.3 TB worth of data, it performs worse than hive alone.(~20% less performance) Details are in the post below.

Evaluating Tez

On a cluster with 1.3 TB RAM, I set the following property :

set tez.task.resource.memory.mb=10000;
set tez.am.resource.memory.mb=59205;
set tez.am.launch.cmd-opts =-Xmx47364m;
set hive.tez.container.size=59205;
set hive.tez.java.opts=-Xmx47364m;
set tez.am.grouping.max-size=36700160000;

Is it normal or I am missing some property / not configuring some property properly? Also, I am using an older version of Tez as of now. Could that be the issue too? I still to bootstrap latest version of Tez on EMR and test it and see if that could do any better

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