I've never been keen on this
I've never been happy to do this, and in effect just don't fly. In a PA28 I fly an approach speed of 80kts. Adding 12.5, or even just 10kt, for gusty conditions means an approach of 90kts. I wonder how much longer it takes to bleed that speed off, and how much longer the float is ?
Never been keen to find out, personally.
Why only 2 notches of flap ? I've heard this bandied around a bit ? What does removing the drag flap get you ?