No, sizing down will not help you butter. Learning how to butter will help you butter
(edited per jdang correction)
If you know what you are doing, it doesn't matter what length board you are riding.
If you are bad, you are going to be bad no matter how short a board you get. The board you have is almost ideal - don't delude yourself that skill is one credit card purchase away!
Trust me... no board is going to let you ride like this:
You probably immediately though "what board is that guy riding?" and missed the complete point of my post... sigh. I'll force you to search to find out... but it is stiffer than the Westmark... directional, TRADITIONAL camber board... from 2008.