Trouble shooting from 1/2 way around the world is hard. You must give much more information.I am using 5K pot for Rt and 1nF for Ct.
I have every component as shown. I have connected as shown but I am not able to get full range of duty cycle but only 75% to 95%.
I think not. See picture below. The block "T" will keep duty cycle below 50%. (only one output can be on at a time) If you connect COL 1 and COL 2 together than yes you can get 90%.but only 75% to 95%.