It's not the longer rod it's the longer cast that has an effect.
If you had a good hookup rate on the 10' and now fishing longer range with the 13' it would indicate that your hook setting is the problem as the trace is successful at shorter range.
Remember that nylon stretches (elongates) 15-22% so that has to be countered to set the hook.
If the fish drops the bite indicator into the water then pick the rod up, swing it to the side (away from the stand) reel fast to make contact with the fish, you will feel the rod loading up and the tip bending, by now the tip of the hook is in and all you need is to make a short swift strike that will pull the barb into position.
Same if the fish is running and you are missing them. Set the drag tighter so that he must almost move the rod in the stand to get the reel running, now the hook tip is in and same as before carry out a short swift strike to the side (while you have contact with the fish - road must be loaded (slightly bent)
If you just strike without taking up the elongation you are striking into the stretch and not setting the hook and this will have more of an effect when fishing at a long rande than at short range.
To get your head around it, walk of 25m of line and hold the sinker in your hand and get a mate to strike, you will feel it
The walk off 100m and get him to strike, you will see him striking but nit feel it.
Then carry on walking let him hold the rod to make contact as you walk out the stretch and load the rod and if he then strikes, short and sharp you will feel it.
