Google ZigFins for their blurb. Less drag, more release
Re Bonza fins,
when we were last up Darwin with MangoDingo, discussing the fickle nature of TopEnd waves and the dream custom boards n fins to get the most out of them. I intended to get a Custom 5fin Bonza with Darwin brief specs so ordered custom Hanalei Bonza fins with Darwin windswell brief discussed.

Haven't got to try them out.