I believe that you have upset the growth rhythm of your cat. From your brief comments about fat bulbs on your previous years' growths, you probably have a standard size cat. If that is the case, a typical growth cycle is like this. A new shoot emerges in the late spring or early summer and develops over the course of the summer during the warm, long days of summer. Then as the days of fall become shorter by a few hours and also cooler, the new bulb matures and fattens as it stores nutrients necessary for the blooming period. After forming a fat storage bulb (very big and fat in cooler temps), the plant undergoes a pause in its growth cycle as it prepares for its eventual bloom.
If it is a standard cat, it will probably form a sheath which may turn brown and dry before a flower spike and buds form a few or many months later.
By giving constant prolonged hours of light you are simulating kind of an endless summer and the plant is being fooled into producing numerous consecutive new growths that never fatten up properly. I am guessing that in conjunction with the constant prolonged hours of light, you may also be providing fairly constant temperatures. As you suggest, the heavy constant feeding is probably also a contributing factor to your plant's non-blooming problem.
While your options may be somewhat constrained by growing under lights, you do need to have your standard cat experience at least some seasonal change, because it is probably a seasonal bloomer, be it late spring or fall.
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