I want to surf my 9'1 Astro as a single fin, I have it as a 2+1 setup and was wondering if I can just take out the side bites or if I need a different size fin.

I obviously surf in SA, waves are usually less than ideal, fat and weak, beach breaks only blah blah blah

Here are some pics of the board, some of you are fin experts, I personally have zero knowledge of fins.

Please help!