I'm looking for fins I can use in shallow waters on my SB iS130 (85cm) and SB US147 with big sails (8.4 & 9.6). My local beach has loads of sand bars and regular XL slalom fins are no good.

I started looking at weed fins, them came across the MU Delta XT carbon fins. I also saw this video of a 24cm on an iS107

Will the Delta XT in 27cm and 30 be ok for my boards? Iv'e never tried these fins, or weed fins and just want to get it right first time around.

Or am I better going down the weed fin route and what sizes would be best for me?

Thanks in advance:)