Overcoming slapping habits with forehand

Hi Alois, 

I have been playing tt for 9 years. For 6 of those I did not hear about the need to brush the ball, so I developed a slap forehand approach and I fall back into it as soon as random play steps in. 

In regular drills, when I focus on the technique, I can perform more of a brush. But I lose it once random drills or play start. I am being coached 1hr per week with focus more on random skills to help me with game play. I don't have a training partner who is willing to do drills which could help me develop the brush in forehand top spin. In having a hit with the random ball placement I find it really difficult with maintaining focus on brushing action. 

Do you have any suggestions on what I can do to get out of my slapping default action to brushing action with my forehand. 

Thank you for your help 

Cheers Alena