While I have no experience with the ST126, I have used weed fins for years. The ones that have impressed me the most are the Lessacher Duo Weeds, which are asymmetrically foiled. I have a 28s that I use in a 5.6 to 7.0 range, and a 34 that I use with an 8.3. Even though they are raked at 45 degrees and the leading edge is not set forward of the finbox, the lift that these fins offer is amazing. Also, their windward ability (a traditional weak point with weed fins) is outstanding and they're incredibly resistent to spinout. I attribute these performance qualities to the asymmetrical foiling concept. I can't prove that scientifically, but believe it nonetheless, as it's hard to explain their brillant performance otherwise. Overall, I wholeheartedly recommend them without reservation.