Well it is actually getting easier to start. The transition from idle to full throttle has no hickups at all. It will idle forever without dying. I can set the idle to 1600 roughly without dying, it's just if I cut the throttle from WOT, the idle drops momentarily enough to quit. Maybe it just doesn't like the Zinger prop. Either way, if I was flying it, I would just bump up the idle for flying, then slow it down for landing. If it's like my other engines, I'll just fly it as much as I can to break it in and then really fine tune it.
Lars has a point, but the idea behind covering the transition is due to the fact that these little carbs don't have accelerator pumps, so when you crank open the throttle it gets a huge gulp of air and no fuel. Then add in the fact that an engine will usually run somewhere in the 15/1 air/fuel mixture at a constant RPM, but needs about 12/1 for acceleration and the difficulty becomes apparent.
Bye the way, it's been quite some time since I worked on a full scale with a carb but IIRC everyone I've seen has an accelerator pump.
I don't wish to be harsh, but most folks who've been around GS stuff for awhile consider the Zingers to be suitable paint stir sticks, but not for aircraft use....
I know props aren't cheap, but you'll be surprised at the differences in flight performance you'll get with some other brands. The really hard part about prop selection on the GS stuff is that no two setups when combined with different flying styles are the same. So you can ask some questions about what people like, but their favorite prop brand/size may not be the best one for your model/engine combo and flying style.
Do a few searches on props and you'll find there are some VERY brand loyal folks as well as those who will make some generalized suggestions based on their own experience.