Feed feed feed. I am still experimenting with exactly what to use but your first step is to increase the amount you used last year. As for what, this depends on your varieties as some species don't like too much, but assuming hybrids, then I use 1/3 to 1/2 strength miracle grow weekly early in the season (nitrogen for the leaf) and 1/2 strength tomorite later on. Some of my friends report good growth using the orchid fertiliser Akerne's Rain Mix every watering so some of my surplus Tongariro are acting as Guinea pigs this year.
I would not be removing growths as a healthy bulb should be able to produce two new bulbs, although I have no experience with seedlings.