First thought: I don't know what you're doing wrong, but I wish I could do the same wrong things and get all mine to grow like that! I just started growing Encyclias this fall, and that looks like a sister to one of mine. . . a big, big sister.
But -- even if you think it's getting enough light, you can always try more. I just went to a serious CFL grow-light for the first time this past fall and although I haven't had it going long enough to see the effects on blooming, my pink spotty Catts are getting pink spotty leaves for the first time, which is a good sign. Because the bulb puts out very little heat, I can offer them a lot more light than I even could on the windowsill.
The other thing to think about is starving the plant a little. Even the ones whose official care sheets don't say they require a winter rest sometimes can get an extra kick toward blooming from that. We like to say it makes them happy, but part of why that works with some plants is that their chemical signals say, "this place is terrible! I better bloom and try to get my genes into better digs!" I explained it to a friend the other day by saying it's like waterboarding: you trick the plant into thinking it's in danger of dying in order to get it to give you what you want. So my sense of humor is a little dark. But seriously! Scare it over the next couple months and see what happens.
Other people may have smarter things to say because I'm only a very amateur grower and like I said, new to Encyclias -- but I'm up and felt chatty, so maybe this can at least be something to think about.