DYN from under water

As you can probably see from these two videos there is still much work to do. Here's what I'm working on:

• consistant number of kicks per length, which means keeping the power up, more kicks seems to add a lot of time per length time too.
• not arching through my back (the fin that's on it's way is meant to be more neutral in the water as I'm so buoyant I don't need a floating fin).
• not moving my hands up and down so much - this should also be resolved by a more neutral fin
• trying to get more out of my abs and less from my legs - however I do seem to resolve this once the lactic builds up in my legs
• consistantly achieving more with a fin than without (sadly I've only done 2 dives with a mono that are longer than my DNF PB)
• positive outlook on wearing a fin