Re: hard to start my cayman help
Does it sound like it is slower turning over when you crank the engine?
I would suggest your fault is more likely the battery, which is not an uncommon problem. The fact it occurs when the car is hot would tie in with a battery, because knackered batteries will get hotter when in operation and once hot don't perform as well as when cold.
The above is only based on what you said and could be completely wrong, however to get a battery tested is cheap and easy so is where I'd start. It's also best to get it checked ASAP, because it it completely fails it can become a bit of a pain.
If you still have good performance once started i.e. good acceleration, then it is very unlikely to be the injector, especially as it wouldn't normally get better when it is cold and worse when hot.
2008 997 GT3
PTS RS Orange