Hello Devendra,
Yes that was right process you did.
Did you restart the system after parameter change ?
Generally this issue comes when Big data is transporting from one system to another and you said you are facing this problem in FAGLFLEXA table. This is Finance table and definitely very high volume data is exists in this table.
Can you paste the log specially for this TR created in /usr/sap/trans/tmp folder for more analysis.
Regards
Pranay