Try thinking about it like this.
Give each block a number usually between 1 and 3 inches, being how far the ball will travel laterally wihiles crossing each block. Blocks are 2ft long so a 24 foot put will have 12 blocks. If all dots are taking 8secs (give or take) to move left to right you can assume that the ball on anything above 9.0 green speed will move 2" per block. So you aim 24 inches left or right depending on °slope angle°. Ya dig!?!¿ Each course is different and I find tournament speed is actually the most accurate with that formula. But it works for most. I have upon occasion come to find that 6" per block over a short span is not un heard of. Its usually occurs when you tap aimer and the dot moves to the next line in under 4 secs. Again it's a close and guess formula I use(dont think its gonna win you any head to head lol time out freeze! Once practiced thou. I hit 20-50' putts regularly. I adjust speed depending on course and overall level of game sodamii (inless the readers into that,...i dont judge) In the moment! GL and happy tappy to ya