I'd wait to repot as well, it's not the ideal time of year. At least wait until late winter or early spring and even then wait until there's new growth or signs of new roots. Since these grow year round, it's not as critical to avoid winter repotting as it would be with other genera, however, it's still advisable to wait until it's warmer and natural day length is longer.
These do seem to bloom best when they are a bit root bound. Overpotting is definitely riskier than underpotting.
Also, going from 2 growths to 5 growths in the course of 2 years is certainly a reasonable and respectable growth rate for these long petaled species. So, I think it's mostly just a thing where you'll need to be more patient. If you can increase the light levels a bit, that might help as well. And certainly if it's not in bloom by 2020, then it may be that your light levels need to be adjusted upwards.
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