You have 3 choices:
(1) Leave things as they are;
(2) Edit the drama recording’s timers and add padding manually. This will stop that particular timer’s series link functionality and so you will also need to set the repeat option to daily / weekday / daily etc;
(3) Update the padding options on the 9150T. This will stop all series links working and you will need to set the repeat timer option for all current timers and all of those you set from now on.
I’d go for (2) if I was just using a 9150T.