Flower spike on my Phal equestris is too short

[mtessa]

The flower spike is shorter than last year. Last year's spike has a keiki but the keiki is not growing roots or leaves.

It was repotted last year in orchiata and perlite with leca at the bottom and this winter I added a layer of sphagnum moss on top.

The roots look healthy but the latest leaf a little smaller than the last leaf. Maybe it needs a bigger pot?

The humidity in my condo is pretty low (20-30%) so I added a top dressing of sphagnum moss to most of my orchids. The humidity should improve when the weather warms up.

Any advice?

Thank you!