There are plants of Paph. Sandcanh (canhii X sanderianum) out there and the pic I saw was pretty cool: 8" blooming plants in 4"-5" pots with 2-3 flowers on a single spike
When I water, I use only water. I foliar feed 2-3 times a month in summer, and I use a tiny bit of slow release fertilizer in the pots.
Regarding cnycharles comment above, I grow Mexipediums hot, humid, and bright!
I grow them in a bark/peat mix, in 3" pots, and water every 5-7 days.
The big plant is in an 8" bulb pan with peat/gray rock mix and gets watered the same.
FWIW - When I use those clips, I put the tips of the claws around the flower stem. If you look at the inside/base of the claws some clips have blocks, and others have a very narrow angle, that might pinch closed and cause problems?
FWIW - in my experience Dor./Phal. pulcherrima grows slightly drier than the typical Phal., and slightly brighter - almost 'Cattleya light'. In-situ photographs largely bear this out.
YMMV :D
Did the plant get too dry while attempting to bloom?
As mentioned above, the Brachy X multi hybrids are problematic and I agree with blooming it 1-2 times more to see what it does. Too much potential to not try again!