Nice! I got back to my first ever racquet, from 8 years ago, light 102 sq.in. Yonex. Had been using IG Prestige MP, modded and unmodded.
I didn't change anything in swing. I serve better, play more consistent. Light racquet actually forces to keep technique good and the stroke full. Otherwise the ball would not travel past the service box. But it's relatively easy to swing, so keeping the stroke full is easy.
I now feel the heavier racquets, for 3.0-4.5 players, are lazy man's sticks. The weight enables to NOT use full swing, but still keep the ball deep. The weight also adds control, so poor technique is covered by the racquet. Player is not required to develop control in the strokes, which is bad for the development.