Again some cloth has a thicker nap. I play on 20 plus tables; 42 total in the house where I play. One table, # 26 sees the least playing time and has a thicker nap cloth on it. It plays like yours. When we play on it we just hit them harder. I did watch the video.
I can understand you not wanting to waste money recovering the cloth. As long as your seams on the slate are not wax iron away. I did it to a few tables years ago. It helped a little. You could also re stretch the cloth but don't over stretch it. The last thing that comes to mind is you're in Australia. Is the table in a very humid area? That can cause a table to play slow. If so a dehumidifier would help.