Keep an eye on the speed trend arrow. If it is pointing towards your foot then you are about to lose speed. Apply a couple of extra percentage power, see what happens to the speed trend arrow and if it is still pointing downwards add another couple of %.
Try not to over react by adding or subtracting handfuls of power - just a couple of % each time but keeping scanning attitude, speed and the speed trend arrow.
Don't worry - we have all been there! If you keep scanning it will all come right.