You are very observant. This is a common situation especially with the small tote type cylinders. Yes, it is very easy to over exceed the rated withdrawal rate of the cylinders. The reason it still works, though, is the timing. Usually, the torch is used in short time intervals with small cylinder setups.
Any tip can overheat if operated long enough with insufficient fuel gas flow.
Any acetylene cylinder can have acetone be emitted if over withdrawn over a consistent period of time. The rule of thumb, for the tips in your kit, is to not operate continuously for over 15 minutes at a time. All manufacturers of small kits like this experience the same limitations.