First thing first,I'm a newbie in landscape.

I tried stacking 3 stop soft,2 stop hard,both ND filters.
The filter is 10x15mm,half coated on one side and the tint on a side can fully cover a 12-24 at it's widest.
Time was around 5.30 at changi broadwalk and while I tried to include the blazing bright sun at the top left of my frame and at F22 A mode,I wasn't able to get a certain starburst of the sun.
The wave were also non misty since longer exposure would blow out my sky and easily,the sun.
I need more filters?Yes?