When they are blooming, mine will get little lead bumps, but they seem to stay small until the flowering is over. When they are ready they will take off and grow at a normal rate. Flowers just seem to suck all the energy the plant has. Only really old, well established plants grow leaves roots and buds all at the same time. They need alot of healthy storage bulbs to pull that off. That is why I have begun to only split the biggest and overgrown specimen plants. The larger the plant, the more spectacular and colorful the flowers.
Sounds like you are doing well already!