C. Summer Spot 'Carmela' blooming tricks?

[Dcchase]

I've had this plant for about a year. It was considered blooming size when purchased. It has almost doubled in size since I repotted into moss last summer. It gets plenty of light with 3 T5 bulbs and a westerly window. I thought it might be putting out a spike but after about 1/4" it just stalled. That's in the first photo.
I'm going to try and add some photos.
Any ideas about what might help bring on some flowers??

Thanks so much for your help!