Yes, its very addictive.
It certainly sounds like the first 3 lots were baked.
I think you have fixed the issue yourself by upping the quantity.
Ambient temp counts too (and outside is always best due to smoke and chaff) but I think simply upping the amount was the main component.
If the beans are really swirling in the popper, it usually means there arent enough in there.
At 110g, if the beans are still moving without any assistance from you, then you might even be able to go up another 20g.
As the beans roast they get lighter. Therefore, it might be a bit sluggish to start with and might require some manual agitation, but as you progress it should become more fluid.
Welcome the the light brown side.