Hard to tell what is happening without seeing how you are trying to resize. I have attached a modified pop-up task button scene. You could import this into your tasker and see if it is closer to what you want.
To import the modified scene, put it in a scenes subdirectory within the Tasker folder on your device, which is usually:
The scene name can be changed I've imported. These days, I tend to add my user name to prevent import issues due to name space collisions.
I've made only small a change so I can try to get an idea as to what you want. Showing a picture of what the stock scene is doing that you want to fix might help.