Ahhhhh-
What you got there are the Scuba pro twin jets, I guess the adjustable term comes from the heel strap? Or open heel style compared to the full foot design. I guess just some confusion on terminology, and the reference to adjustable force or tweaking of the fin, I have not heard of that feature. Sounds like a confusion between force fins and twin jets.
But I do like the twin jets for nearly all types of diving, if you like cruising around with an incredible efficient fin the twin jets are great, very comfy. However if you need high intensity movement like moving heavy objects or carrying heavy gear with you I would say they are not the best choice. If this is your situation go with the jet fins or something very similar to that design.
My only advice is to go with the black pair, they are made of a stiffer material that the majority of people enjoy as compared to the other colors which are softer and gentler on old injuries if that is a concern.
JUMBO