[Bill]

I can hardly feel any difference between the 30s and 80s until I widen the kick. That's how the 80s work best. A few years ago, when my legs were stronger, the 40s were about ten seconds faster than the 80s on a 60 meter dive but they seemed to take a lot more effort. I was 80 kilo then.
Think of the 80s as different more than softer.