I did some digging around on my own, and I think I got it.
When performing a typing process, a Type Into process is created. If you click on this process, on its Properties (tab shown on the right), under Options, there is a DelayBetweenKeys option.
Apparently its default value is 10 milliseconds, which is a bit too fast. I tried 100 ms and it worked perfectly. 100 might be too much, so some trial and error until you find the fastest time which performs robustly would be the best option.
Hope this helps! 