I've been looking for trim tab kit and found someone selling an insta trim tab kit 9"x12" pretty cheap. I wanted to go lenco or bennett, but im finding this deal hard to pass up. I have 2 questions 1) does anyone have any experience using insta trim, how do they compare to lenco or bennett? and 2) he said that 9"x12" is for a 20-25' boat but im not sold on this, all the research I found says tabs for my size boat should 10x12 to 12x12. Is the 9x12 the correct size for my boat?