FX16 but with more chain
I used a Guardian G11 on my Catalina 30 (10k displacement too) with similiar results to yours, even with the mud-palms. However, after upgrading to the Fortress FX16, it has always held, albeit I also increased my chain length to 45' at the same time (5' less than minimum rode I would ever use).Perhaps your anchor chain length is too short. Lightweight anchors actually require longer chain than heavy steel anchors.I increased my chain length beyond, but based on corrected recommendations now found at Boat/US's web-site -- see the link below (I actually assisted BoatUS in revising Catalog's rode chain recommendations a few years ago based upon Earl Hinz's recommendations).So, if the mud-palms don't do it, review the link's chain recommendations and try that before getting a 'back breaking' heavier anchor.Hope this helps..