Lc. Lorraine Shirai 'Raye' x. Lc. Lou Gilmore 'Hartford'

[EDDIE]

Hey guys!
I have had this cattleya for about 3 yrs. now...when I bought the thing it was supposed to be blooming size, it hasn't bloomed yet! It is a bifoliate...it has 5 mature growths + 2 new ones (the oldest of the two new growths has 2 leaves, the youngest growth is too soon to tell) I thought for sure that the oldest of the two new growths would have a sheath, but not so far! I keep it in a south window (the outside of the growths get a little sunburnt) the growths are olive green and it is in a 4" plastic pot, it is pretty cramped in the pot it is currently in (the id tag won't budge). I water it weekly, so it gets dry in between waterings. I usually feed it after every watering with 19-31-17 and a dropper full of superthrive plant hormones mixed in a gallon of water; although the past couple of weeks I've been using 20-10-20. Does anyone have any suggestions about what I can do to get this thing to sheath? Also, it has the night drop in temps. I can't seem to figure out what I'm doing wrong Thanks for any help you can give!