It sounds like you're saying that your light schedule is 18 off/24 on. Am I reading that correctly? Or are those numbers meant to represent temperature in Celsius? I'm in the States, and although I would have to agree that the metric system is more efficient, it never really took hold here, especially temperature. Most Americans know a little bit of grams/kg, fewer know that booze comes in 750ml bottles, but Celsius might as well be Latin.
During Veg I do 18 hours on/ 6 hours off. Then to trigger flowering I switch to 12 hours on/ 12 hours off. This time around I'm thinking of increasing the flowering daytime light by 5 minutes per day, my thought being that more light means more growth. I'm not sure if that will work, I don't know if it will trigger re-vegging, but it might be worth a try.
Ten percent at a time is what I read, so that's what I did initially. Once I got them shaped like I wanted, I re-trimmed each plant every third day eventually removing more growth than I left on. I've got 3 plants growing in a small (4ft x 4ft) room, so they can't be too bushy.
Thank you for all the information, Oldmanbud50, and good luck to you too brother.