RK3HD vs. RK4 Buoyancy

[Jerome.st]

I'm looking for new fins that are negatively buoyant but not heavy.

I dove the RK3 and liked them, but they were too positive. Now that the RK4s are out, I wanted to ask if they are negative or positive?

 

[Karlstumke]

In between RK 3 and RK 3HD. Try scubspro tec. Allows u to weight them

 

[grantmac]

The RK4 is new enough I'm not sure many people have actually dove them.
I find the RK3 very light and too flexible.