Sharepoint 2010 Cascading dropdown in nintex forms

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Hi,

The cascading drop down functionality provided by Nintex is taking time to populate dropdown options when there are more than 5 dorpdowns. So I decided to implement the same functionality using SPServices (Jquery).
http://spservices.codeplex.com/wikipage?title=$().SPServices.SPCascadeDropdowns&referringTitle=Documentation

When I implement the SPService in OOB Sharepoint forms its working fine. But when I implement the same in Nintex forms the same functionality fails (not working). I followed instructions specified in below link
http://sharepointpapers.blogspot.ch/2013/08/nintex-forms-with-spservices-library.html

But no luck. Am I missing something?.Any help would be immensely appreciated. Thanks.

Teja