I would be curious to see what the differences are in the setups and geographical locations of folks who successfully breed year-round, but my animals appear to know when it's autumn, and that's when they begin displaying breeding behavior. Males go off feed, and females become receptive. At other times of the year, there hasn't been any interest.
I expect that people closer to the equator, and people who have their animals on completely artificial light cycles, may have more success with year-round breeding. I use ambient light from windows for my reptile room.

Rich, you needn't take it so personally that some of us use 1500 grams as the minimum weight. I have bred a few animals that came into the breeding season at 1500 grams, and then went off feed. When they produced clutches, the results were extremely disappointing, and the females looked terrible. Your results may be different, but based on mine, I do my best to avoid breeding girls that aren't up to weight, and pull them if they go off feed at that weight.