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Small image target in near field

I have a small image target (4x8cm) which need to work in short distance (40cm) area, and it requested stable tracking position. 

 

https://developer.vuforia.com/forum/faq/how-can-i-improve-detection-and-tracking-stability

By follow the check list above, I got 5 star rating, and fit with most of the request but  "a physical printed image target should be at least 5 inches or 12 cm in width and of reasonable height for a good AR experience." which is very difficult to increase the size by my case.

 

In current testing result, mostly scenes works fine, but the position will jumping case by case. 

Is there anyway I can improve the stability with my current condition?