Hi Owain Glyndwr,
increasing AoA is not going to give an increase in flight path angle unless accompanied by enough thrust.
I don't quite understand that statement.
If we consider the conversion of kinetic energy to potential energy from say 112 kts (achieved) to 107 kts (a guess of flying possibly 5 kts slower).
1/2 * m * Vsquared = m * g * h.
re-arranging, Delta h = {(189 ft per sec)squared - (180 ft per sec)squared} / 2 * 32.
By my maths, if the aircraft had swapped another 5 kts of airspeed for a gain in height they could have climbed 52 feet. Even then, they would still be below 100 radio.