Nice work, well done.
In JAT3 V2 you can create duplicate your profile (whichever one you are using for the other pages). To do this go to the template manager and select your template. Select the profiles tab and click on the profile you are using where you will find a clone option. When you have cloned go to the layouts tab and clone your default layout.
Edit the cloned layout then find and remove the line below.
[PHP]
<block name=”mainnav” type=”mainnav” main-inner=”1″></block>[/PHP]
Return to the profile tab and for your new cloned profile select the new cloned layout.
Then the final stage is to use the “Language & Page Assignments” section on the left to select which menu item you wish that profile to appear on.