Just my 2 cents
That steep aproach would mean a hefty pitch change with the addition of power at the same time to arrest descent ?
Too much to do at once to begin with and perhaps why 172s don't have 40 deg. flaps anymore.(now putting on a helmet)
I would suggest a more stabilised and mabe a little flatter aproach to 50 feet and pull back the power to drop you onto the spot with a "little" burst of power to arrest descent before the flare.
This shouldn't mean dragging it in ,just moving your aim point back a bit from standard and using smaller throttle changes to control descent at the end with smaller changes in attitude to nail the minnimum speed.
Aim for a specific point every time till youve got it sussed and then move back.
simple to write, harder to do
Gog