What concentration are you mixing your fertilizer? Many here are using 125 ppm of N with every watering. I know I'm getting good results, even with my Catts which have been my nemesis. They're actually blooming this year. With your 20-10-20 formula you should be using 1/2 tsp/gal of water. Too much nitrogen can also prevent blooming. I also agree with Don. Too much rooting hormone can cause deformed flowers. Here is a link to Ray Barkalow's fertilizer calculator. All the free info on his site is great stuff. Well worth the time to read. Scroll to the bottom and plug in your N number and 125 for ppm and it will calculate how much per gallon.
Fertilizer PPM Calculator