Wow~ You have lots of differnt stuff! It will be very fun to see when they all come to bloom one day.
Deperle is so pretty in bloom and leaves are nice too I think. Ho Chi Minh is basically the same as Delenatii I read, or sceintists are still trying to figure out. They sure look very similar though! I thought it was supposed to be easy like Delenatii. maybe not.
It does have specific watering needs because of the rain season in its natural habitat. Do you give them enough water at right times? If not, they may not flower along with temperature variation.
I do have a few bulldogs. Unless you have large multi fanned plants of various size, they usually do not flower every year as fans take over a year to mature under regular home environment. At least that is my experience.
Newer complex hybrids with some warm growing species in the breeding background can grow fast and bloom more often. I have Pacific Shamrock (well known green complex) and henryanum (warm growing) cross, and this one grows fast and bloom twice a year. It produces very glossy and beautiful apple green flowers.
I think part of the problem is I never had real good humidity. Last summer it was better and should be from now on as I have a swamp cooler and misters now. I can't let it get real humid in winter still but it is around 45 or 50%. Not real high I know.