Weekend Steam Up

Decided to steam Cackler this weekend, as she's not been steamed again since her re-build over the summer. She ran OK, but of all the locos on the line, seems to be the most challenging to get running at a pleasingly slow speed! She spent a good deal of the time in steam with the safety valve lifting or on the verge of doing so and would frequently stall on the gradient at the back of the loop. Although often self starting she would then continue at high speed; cornering almost on two wheels! Although slow speed running on a circuit with tight curves is challenging, it would be great to get this loco (and her driver) running better. By comparison, the recently acquired Mortimer seems a good deal more controllable. Top priority will be relaying the rear of the loop to take out the gradient, which should allow more measured running. I also wonder whether adding a smaller bore chuff pipe may help tame Cackler?!?