Returning a medium fast Topspin against deep backspin

Dear Coach,

At our club, many opponents would attack on high / slow topspin by simply taking a step back and smash or fast loop.

Hence, my strategy on a strong and low backspin is to chop-back until the ball is high or perform an aggressive topspin.

My aggressive  topspin is not consistent as I am unsure of the forward movement which is critical for aggrresive topspin whilst performing well the upwards movement.

1) If start position say 50cm from table with bat below table and open at say 50 to 60 degrees ( between knee and table height)

2) More upward movement and finish at 90 degree angle arms.

As a guide can you help me out with the forward movement as this is important for the fast topspin.

1) At the finishing 90 and 90 degrees for arms and elbow, should my elbow be pointed to the opponent?

2) How far should my palm be away from my forehead after the shot?

3) What is the best racket angle for heavy backspin.

In short , the start postion was 50cm away from table where should my palm ( and bat) be at the end of the shot.

Regards

Rama