thanks for the parameters. If the controlled plant is defined by
then there is no need to use Smith predictor. A simple PI (k=16.859, ti=5866.1) or PID controller will work fine.
However, if you insist on using the Smith predictor, then the blocks inside the Smith_predictor subsystem should be as close to the controlled plant as possible. Because tau1 and tau2 are close to each other, you should use MDL function block as in the original example. And for sure, the only difference between the upper and lower block in the Smith_predictor subsystem should be the time delay. The gain and time constants must be the same.
The parameters which you provided can hardly lead to satisfactory closed loop performance.