I think "what you see is what you get." Why did you buy it if you did not like the trigger pull? Perhaps Wolff makes a spring kit for the Pony, but the gun is so small that I suspect it has to be the way it is to be reliable.
Before the Pony PL was discontinued and became a collector's item, I heavily modified one for carry. Reshaping the trigger by rounding the edges and straightening the "hook" was very important for comfort and control. I also rounded the muzzle and took off the silly long tang to make it smaller. I then lightened the slide to make it lighter. It remains totally reliable, and is my carry gun of choice in its power/weight/size category.