I like the "bulb pan" form factor a lot, to help get around the fact that there is too much volume as the diameter gets larger. The inverted pot in the middle helps mitigate that problem too. Also, don't be too quick to "remedy" crowding... The stress of being rootbound does seem to encourage blooming, if there is room the plant is likely to just grow leaves and roots. I know that with my Cyms, they bloom best just before they break the pot.