ZDZ Fans and those who aren't - I need yourhelp!

Last June I purchased a ZDZ 40 RV and at first everything seemed normal. After fuzzing around for the summer (ZDZ has a whole procedure ...) I still experienced some reliability problems and almost ruined some planes due to dead stik! A friend of mine told me that I should send it back and get it fixed. I did and they send me a new engine because they did not have the time to do the fix! Well, the bad part: Once again breaking in the engine and the carb was offset differently and I had to change the engine mount on my planes - ggrrrhhh. Now I experienced a new problem: the new ZDZ40 RV is a pain ... to start. I heard from another friend that I had to start it at at least half throttle and ... that's scary - but it somewhat works!
For break in purposes I run the engine on a big trainer (Triple fun). The new engine idles a lot beeter than the old one and puts out a lot more power but - it just quits out of the blue!!! I fly full throttle and suddenly the engine stops. I checked the fuel lines, gas, high end ,,,,,,,,,,, I am just getting sick and tired to have dead sticks for I don't know what reason and I definitly don't want to dead stick my Giles / Extra!!!!

Can anybody help me? If ZDZ can't get it done - what would be an alternative - and NOT a challenge???

Thanks for help
Rainer