I have several (of this grex and others). The Alba actually seems to grow better for me than the colored form. Or at least blooms better...
For me, growing under lights, they bloom predominantly in the fall (about this time of year). I don't treat them in any special way. I don't get gigantic specimens. Usually just a few growths, so I am probably losing old growth at a similar rate to the new growth forming. I'm sure someone grows them better. Hybrids made with charlesworthii also bloom mostly in the fall for me.