Hmm those sound like symptoms of flooding. The gas pooling in the reed block stopped the engine if you landed or grabbed the plane and moved it suddenly while it was idling. It did not cause hard starts with warm engines (not that I know of anyway). A guy at my field had the gas pooling in his engine and it died everytime he landed (or very close to every time).

OK, I just called DA since I have many minutes left on my cell phone (and you live far away). The first thing he asked was if you were choking before the warm starts. In other words you only need to choke once at the beginning of the day. Then after that just turn on the ignition, throttle at idle, and flip it (mine starts the first flip every time when it's warm). So you are more than likely flooding it if you are choking it every time you start it. Also he said to start at 1 3/4 on the low end and lean for a good transition. If your transition is good then you are good on the low end.

The high needle he said to start at 2 turns. Start the engine run it up to full throttle for 15 seconds, if it loses RPM it's too lean. If it does not lose RPM's it's rich (we'll assume it's rich starting at 2 turns). Shut down engine and lean out the high end (1/16). After it cools a little while (2 minutes) start it again. Keep leaning until it starts to lose RPM's. When this happens you have found the peak (actually passed it) . Now richen it to get it to hold constant RPM at full throttle. Find the leanest setting that will make it hold constant RPM for 15 seconds (at full throttle).

Never run the engine more than 30 seconds on the ground so you don't over heat it.

I hope this helped.