question about clipping value and soft round function

Hi, first really thank you for your work!

Now I'm reproducing your work.
I have two question about clipping value and soft round function.

1. When I set learning rate to 10e-4, graident values are diverged. So I use gradient clipping and set the value to 0.01.
I wonder if it is reasonable value.

2. What value did you set to tuning parameter alpha?

thank you in advance!