No... difference isn't that big...SPECIALLY in a current.
Here's a tip for using the Volos... smaller, and faster flutter kicks work best (about a foot and a half apart max). This seems to allow the hinge, and water channels to works at their peak. Wider, slower kicks allow the hinge to flex too much and make them flex at an angle too shallow to thrust much water. I've also noticed that making small bicycle kicks (a small 1 foot circle) seems to take advantage of the Mares channels the most...specially with the Volos. These kicks might come in useful in a current when using the Volos. I own the Volo Race (fullfoot versions of the Volo Power) and I was pretty happy with them. I say 'was' because I recently switched to Jets due to my up coming training with GUE. But I have to say that the Volos, when used properly, are much faster than Jets using the FLUTTER kick, and don't tire your legs out as much.
One thing I have observed, learning from the GUE logic of frog vs. flutter... when you allow your fin to break your vertical plane (extend above or below you) you cause more drag... this is why they use the frog kick. But alas, the Volos are pretty weak when doing frog kicks. The hinge simply flexes too much. But I have tried different finning styles (most of which are weird), and the small flutters, and small bicycle kicks seem to work wonders for me on the Volos. Give it a try, and play around with the concept. The hinge actually works if you know how to flick your ankle just right. With very minimal effort, you'll find that the Volos do deliver as promised. You just have to find that really weird kick range where you're getting the most thrust that it can give, with the least amount of effort.
Unlike Jets or the older Quattros, the Volos do NOT deliver more speed the harder you kick. They do seem to have a maximum speed limit, since the thrust the Volos provide is based on kick frequency and not kick strength or amplitude. And unless you're The Flash, I doubt you can hit 10 kicks per second.