My continuing discussion with Phill Mann regarding how to tell the difference between these subspecies has nailed down at least one certainty.
If your plants have glabarous (non-hairy) sepals that look like stacks of little smooth balls before the flowers open, you have Drosera paleacea ssp. paleacea.
More information on the other subspecies will be provided once I can find a way to seggergate D. paleaces ssp. roseana from D. paleacea ssp trichocaulis.
Photo: Drosera paleacea ssp. paleacea flowering