Dendrobium Micro Chip Questions on Repotting

[Plodde]

I planted my Dendrobium micro-chip in medium sized orchid bark, and since then it has put out many growths but no spikes. i try to keep the humidity above 60% and the temp at night during winter gets down to the low 60's, high 50's. this dendrobium does like a lot of water and no winter rest.
like i said before my d. micro-chip keeps growing but no spikes. so i must be doing something wrong. but just some more info for you to have on this hybrid